How To Use Momcozy M5

If you’re wondering how to use the Momcozy M5, this step-by-step guide shows you exactly how to set it up, use each pumping mode, adjust suction levels, clean the parts, and troubleshoot common issues with confidence.

This guide explains on how to use the Momcozy M5 correctly for everyday pumping, whether you’re pumping at home, at work, or on the go. It also highlights the M5’s comfort-focused features, including the 105-degree flange design and vibration-assisted mixed mode, so you can get the best results from each session.

Quick Start: How to Use the Momcozy M5

• Fully charge the pump motors
• Assemble the flange, valve, diaphragm, and milk collector
• Insert the pump into your bra and ensure a snug, centered seal
• Turn on the pump and start in stimulation mode
• Switch to expression or mixed mode once letdown begins
• Adjust suction levels for comfort and steady milk flow

Prefer to watch? Check out my full Momcozy M5 how-to video above, then scroll down for the detailed written instructions.

Editor’s note: Pumping Milk is reader-supported, meaning, at no cost to you, I may earn a commission if you buy after clicking an affiliate link. Learn More.

What’s Included with the Momcozy M5 Breast Pump

Before you start pumping, it helps to review everything included with the Momcozy M5 breast pump. If you’re still weighing up whether it’s the right pump for your routine, you can also read my full Momcozy M5 review for a deeper breakdown of comfort, suction, and daily usability.

Photo credit: Pumping Milk

If this is your first time using a wearable breast pump, reviewing all included parts makes setup faster and helps avoid common assembly mistakes. This also makes it easier to identify which parts need regular replacement to maintain suction over time.

What’s included in the box:

• Pump Motor *2
• Milk Collector Cup (180ml) *2
• Silicone Flange Insert (17 mm)*2
• Silicone Flange Insert (19 mm)*2
• Silicone Flange Insert (21 mm) *2
• Silicone Flange (24 mm) *2
• Silicone Flange (27 mm) *2
• Silicone Diaphragm *2
• Valve *4
• Bra Adjustment Buckle *2
• USB Cable *2
• Storage Bag *2
• Storage Box *1
• Flange Cover *2
• Cleaning Brush *2

I strongly advise taking a moment to check all these components are included in your package. If you find anything missing or damaged, don’t hesitate to reach out to Momcozy’s customer support for assistance.

In case you’re using a second-hand pump, it’s essential to ensure that all the necessary parts are intact. Additionally, I recommend considering replacing items like valves, diaphragms, flanges, and compatible M5 flange inserts in accordance with Momcozy’s maintenance guidelines.

While acquiring new valve membranes, valves, flanges, and breast shields may involve an extra expense, it plays a pivotal role in maintaining the cleanliness and effectiveness of your pump during every pumping session.

Furthermore, make certain you have the appropriate flange size that matches your nipple size, which may require a separate purchase.

How To Assemble the Momcozy M5

Properly assembling the Momcozy M5 breast pump is vital for its effective performance.

Upon purchase, your pump will arrive pre-assembled in the packaging, which I find convenient as it provides a clear understanding of its configuration.

Nevertheless, before use, it’s necessary to disassemble the pump and sterilize it.

Maintaining proper hygiene while setting up your Momcozy M5 breast pump is imperative to safeguard the integrity of your breast milk and your overall well-being.

Here are some hygiene tips to follow:

• Wash your hands thoroughly before touching any pump components.
• Disassemble the pump parts that come into contact with your breast milk (breast shields, flanges, valves, membranes, and collection bottles) after each use and wash them with warm, soapy water. Rinse and air dry or use a clean, dry cloth or paper towel.
• Sterilize these components regularly, especially if you are using the breast pump multiple times a day. You can do this by boiling them for a few minutes or using a steam sterilizer.
• Ensure that the breast pump unit and tubing remain dry and free from moisture or milk residue.
• Store your breast pump and its components in a clean, dry place when not in use to prevent contamination.

Now once your breast pump has been cleaned and sterilized you can look to reassemble it ready for your first pumping session.

Here’s a step-by-step guide to help you reassemble your M5:

Step 1

Wash your hands thoroughly with soap and water before handling any components.

Step 2

Attach and secure the diaphragm to the milk collector.

Photo credit: Pumping Milk

Step 3

Connect the silicone valve to the end of the flange and ensure there is a secure seal.

Photo credit: Pumping Milk

Step 4

Connect the flange/breast shield with the main body of the collection cup.

There is a heart symbol of the flange/shield to ensure that you have correct alignment.

I also like to ensure a good seal by pressing my thumbs around the rim.

Photo credit: Pumping Milk

Photo credit: Pumping Milk

Step 5

Press in the pump motor to the top of the collection container.

Photo credit: Pumping Milk

Step 6

Turn on the Momcozy M5 breast pump by pressing the power button. You will see the LCD screen light up.

Now, your breast pump is ready for pumping breastmilk, but first make sure to familiarize yourself with the pump’s controls, including the suction level and mode settings.

Photo credit: Pumping Milk

Buttons and LED Screen

There are 4 buttons used to operate the Momcozy M5, with an LED screen that provides valuable information during your pumping sessions.

Here’s what you need to know controlling your breast pump:

On/Off Button: You can turn your pump on and off or pause it with the power symbol button.

To turn your pump on or off, long press the power button.

Short press the power button to pause. You can then press any button to un-pause and continue your pumping session.

Pausing the pump will not reset your session or mode.

Suction Level: The screen displays the current suction level. You can typically increase or decrease this level to find the right intensity for your comfort and milk expression.

The + button will increase the suction level and the – button will decrease it.

The level you are on will be displayed by a number on the screen.

Pumping Mode: There are three pumping modes on the M5, stimulation mode for stimulating letdown, expression mode for efficient milk removal, and a mixed mode which comes with its unique vibration feature.

The LCD screen will indicate the current mode.

The heart symbol represents the stimulation mode and the droplet symbol represents the expression mode. When both symbols are visible then the pump is in the mixed mode.

You can switch between the three modes with the circular arrow button.

Battery Status: The battery life of the M5 breast pump is displayed when you first turn on the pump with up to 3 bars when fully charged. Low battery will be indicated by a blinking bar.

Photo credit: Pumping Milk

Error Messages: The LCD screen may display error messages if there are any issues with the pump, such as a blocked tube or low battery.

Photo credit: Pumping Milk

Suction Levels and Modes

The Momcozy M5 comes with 3 modes and 9 different suction levels.

The three pumping modes are stimulation mode for initial breastmilk stimulation, expression mode for milk removal, and a mixed mode which includes a unique pump to vibration mode.

The stimulation mode usually has a faster rhythm to encourage letdown at the start of your pumping session, while the expression mode operates with a slower, more consistent suction pattern during the main part of your pumping session.

The mixed mode combines features from both stimulation and expression modes, creating additional options to tailor the pumping experience. What I really love with the M5 is that the mixed mode also has a vibrate-to-pump feature, which can help to loosen the ducts when pumping. This means you can get more milk at a faster speed and fully drain your breast every time to help prevent mastitis or engorgement. 

During all three modes you are able to adjust the suction strength with the 9 different suction levels, from gentle to strong.

I highly recommend experimenting with different levels to find what feels comfortable and effective for you. Start with a lower suction level and gradually increase it until you find the right balance.

Just keep in mind that the strongest setting may not be the most beneficial for milk extraction as it is also strongly connected to your comfort levels. Comfort plays a key role in letdown and milk flow, especially when using a wearable pump.

How to Use the Momcozy M5 (Daily Pumping Steps)

Once you’re ready to start pumping with the Momcozy M5, it is a relatively straightforward process.

Here are the key steps to follow when using the Momcozy M5:

Step 1

Wash Your Hands: Clean your hands thoroughly with soap and water to maintain hygiene.

Step 2

Assemble the Pump: Ensure that you have sterilized and assembled your pump ready for use.

Step 3

Place the Breast Shields: Position the breast shields over your breasts, ensuring that your nipple is centered and can move freely within the shield. Create a gentle seal by pressing the shield slightly against your breast.

Step 4

Secure your Pumping Bra: One of the main benefits of the M5 is that it is a wearable pump, therefore it can fit snugly into your bra without any cords. So, once you have a secure fit over your nipple, ensure that your bra is also secured. You’ll want to make sure that the bra you use is stretchy and your pump fits in it nicely. Not too loose and not too tight. 

Step 5

Turn On the Pump: Press the power button on the Momcozy M5 to turn it on. The LCD screen will light up, and you’ll be able to see the current settings.

Step 6

Select Pumping Mode and Adjust Suction Level: Choose the pumping mode that suits your needs.

Start with the massage mode to stimulate letdown.

You can also adjust your suction level on the massage mode. I recommend starting with a level 2 or 3 on massage mode for around 2 minutes and then once your milk starts flowing, switch to the expression mode for efficient milk removal.

On the expression and mixed modes, I recommend beginning with a low suction level and gradually increasing it until you find a comfortable yet effective setting.

You should feel a gentle pulling sensation, not pain.

Your expression/mixed mode should for around 15 to 20 minutes. 

Step 7

Monitor: During your session it is vital to keep an eye on your milk flow. This will allow you to trouble shoot any issue that arises such as your nipple shield moving or low suction power.

Step 8

Turn off the Pump: Once you have finished with your milk extraction turn off the pump by pressing on the power button. If you forget to turn off the pump, it does have a 30 minute auto shut off.

Step 9

Remove the Pump: Use your fingers to break the seal between the flange and your breast. Lean slightly forward when removing your pump to prevent any spillage.

Step 10

Pour the Breast Milk into A Storage Container: You will not be able to store your milk in the collection cups, thus you will need to transfer the milk into a suitable storage container.

Remove the motor first and then carefully pour the milk into your storage container. I do love that Momcozy M5 comes with a handy pouring spout to make this easier.

Step 11

Clean Your Pump: Once finished with your pumping session you will need to clean your Momcozy breast pump by washing all the parts that have come into contact with your breast milk. This will help to ensure the hygiene of your pump.

Step 12

Check the Battery Levels: After you’ve finished your session, I highly recommend checking the remaining battery life on the pump. Recharge the pumps if needed so they are ready for your next use. The charging port is located at the back of the pump motor.

Step 13

Store: Once clean, store your pump in a safe and secure location ready for the next use.

Photo credit: Pumping Milk

Momcozy M5 Components

Before you start using the Momcozy M5 breast pump, it’s essential to have a clear understanding of its components and controls.

Here’s an in-depth overview:

Breast Pump Motor

The main unit of the Momcozy M5 contains the motor and power source. It’s the heart of the pump, responsible for creating the suction necessary for milk expression.

Milk Collection Cup

These are the containers that collect the expressed breast milk.

Breast Shield/Flange

A breast shield, also known as a flange, is the funnel-shaped part that fits over your breasts. They come in various sizes to accommodate different breast shapes. Properly fitting breast shields is crucial for comfort and efficient milk expression.

On the M5, the breast shield also comes with an attached linker.

There are also different flange sizes available that insert into the breast shield to change the sizing.

Diaphragm

This is a small flat, circular membrane which is part of the valve system.

Valve

This component helps create a one-way valve system that controls the flow of milk from your breast into the collection bottle.

USB Cable

The USB charger is pluged into your pump motor and power source to recharge your breast pump.

Photo credit: Pumping Milk

Momcozy M5 Replacement Parts

Some breast pump parts need regular replacement to maintain strong suction and consistent pumping performance.

If your pump suddenly loses suction or your milk output drops, worn pump parts are often the cause. The first thing to check is your duckbill valves, as these wear out the fastest.

Momcozy recommends replacing parts on the following schedule:

• Duckbill valves and diaphragms: every 1–3 months depending on use
• Milk collectors and flanges: every 6 months
• Charging cables and motors: only if damaged

You can learn more in my guide on how often you should replace breast pump parts.

The most commonly replaced part is the duckbill valve, which helps maintain proper suction during pumping.

👉 See price on Amazon → Momcozy M5 Duckbill Valves

If you want to see all compatible parts in one place, I’ve put together a complete list including valves, diaphragms, flanges, and spare collectors.

👉 Shop the full Momcozy M5 replacement parts list.

Troubleshooting Common Issues

Although the Momcozy M5 boasts reliability as a breast pump, users may encounter common issues that can disrupt their pumping experience.

Here, you’ll find solutions and troubleshooting tips for addressing these common problems associated with the Momcozy M5.

Low Milk Output

• Verify that you’re using the appropriate breast shield size for your nipple.
• Adjust the suction level and mode to match your comfort and milk flow.
• Experiment with breast compressions or gentle massage during pumping to stimulate milk flow.
• Ensure you stay adequately hydrated, maintain a balanced diet, and get sufficient rest to support milk production.

Pain or Discomfort

• Examine the fit of the breast shield; it should neither be too tight nor too loose.
• If the suction level is causing discomfort, reduce it.
• Prior to pumping, consider applying a lanolin-based nipple cream or using a warm compress.
• Pay attention to proper breast positioning to prevent nipple irritation against the shield.

Loss of Suction

• Thoroughly check that all pump components, including valves and membranes, are correctly assembled and securely sealed.
• Inspect the tubing for any potential kinks or blockages.
• Promptly replace any worn-out or damaged parts like valves and membranes.
• Ensure the breast shields are firmly attached to your breasts.

Milk Overflow

• Keep an eye on the milk flow during pumping and power off the pump when the collection cups reach 4oz.
• Maintain the pump at an appropriate angle to prevent milk overflow.

Noise or Vibration

• Confirm that all components are securely assembled and in good condition.
• Position the breast pump on a stable and level surface to minimize vibrations.
• If you experience excessive noise or vibration, consider reaching out to Momcozy customer support, as it may indicate a malfunction.

While many issues can be resolved through troubleshooting, sometimes you may need further assistance.

In that case, I recommend reading through the Momcozy M5 manual and if that doesn’t help contacting Momcozy’s customer support to assist you with any issues you may encounter while using the Momcozy M5 breast pump.

They can provide expert advice, troubleshooting assistance, and information on warranty coverage and replacement parts to ensure you have a seamless pumping experience.

You can contact Momcozy support at support@momcozy.com

Final Thoughts on Using the Momcozy M5 Breast Pump

The Momcozy M5 is a comfort-focused wearable breast pump designed to make hands-free pumping feel gentler and more natural. With its 105-degree flange angle, vibration-assisted mixed mode, and simple on-device controls, it’s a great option for pumping at home, at work, or while moving through a busy day.

Taking the time to assemble the pump correctly, choose the right flange size, and adjust suction levels based on comfort can make a noticeable difference in milk flow and overall pumping experience. Small setup details matter, especially if you pump regularly or rely on a wearable pump for longer sessions.

If you’re working on building a more consistent routine, you may also find my guide on creating a pumping schedule helpful. It shares practical tips to support milk supply, stay organized, and make pumping fit more smoothly into everyday life.

Related Pumping Guides

If you’re using the Momcozy M5 as part of your pumping routine, these guides may also help:

• How to Clean a Momcozy Breast Pump – Step-by-step instructions for washing, sanitizing, and drying pump parts properly.
• How to Choose Breast Pump Flange Size – Learn how proper flange sizing affects comfort, suction strength, and overall milk output, especially when using a wearable pump like the M5.
• Best Momcozy Pump – Compare all Momcozy wearable pumps to see which model is best for work, comfort, and milk output.
• Newborn Pumping Schedule – How Often to Pump & What to Expect – A practical guide to building a consistent pumping routine that supports milk supply in the early weeks.
• Best Breast Pump Accessories – The must-have pumping accessories that make sessions easier and more comfortable.