1. Introduction
The MHarbor MY-378 Wearable Breast Pump is designed to provide a convenient and efficient milk expression experience. This compact and discreet all-in-one pump weighs approximately 262 grams, offering flexibility for use anytime, anywhere. Its design aims to mimic a baby's natural sucking action for comfortable and effective milk flow.
This manual provides essential information for the safe and proper use, maintenance, and troubleshooting of your MHarbor MY-378 Wearable Breast Pump.

Figure 1.1: Hands-Free Pumping
This image depicts a woman comfortably using the MHarbor MY-378 hands-free breast pump while reading a book, demonstrating its discreet and portable nature.
2. Safety Information
Please read all instructions carefully before using the MHarbor MY-378 Wearable Breast Pump. Retain this manual for future reference.
- Ensure all components are clean and sterilized before first use and after each subsequent use.
- The breast pump is made from zero BPA food-grade silicone, ensuring safety for both mother and baby.
- Do not immerse the motor unit in water or other liquids.
- Keep out of reach of children.
- Do not use while bathing or showering.
- If you experience pain or discomfort during pumping, discontinue use and consult a healthcare professional.
- Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. This product is not a medical device.
3. Product Overview and Components
The MHarbor MY-378 Wearable Breast Pump consists of several key components designed for efficient and comfortable milk expression.

Figure 3.1: MHarbor MY-378 Wearable Breast Pump (Main Unit)
This image shows the complete MHarbor MY-378 wearable breast pump, highlighting its compact and ergonomic design. The clear collection cup and white motor unit with control buttons are visible.
Included Components:
- Electric Breast Pump Motor Unit
- Breast Flange (available in 19mm, 21mm, 24mm sizes)
- Milk Collection Cup
- Silicone Diaphragm
- Valve
- USB Type-C Charging Cable
- Milk Storage Bag (quantity may vary)
- Shoulder Harness (optional accessory for added security)

Figure 3.2: Exploded View of Breast Pump Components
This image illustrates the "Split Structure" design of the MHarbor MY-378 breast pump, showing how the motor unit detaches from the milk collection cup and flange for easy assembly and cleaning.
4. Setup and Assembly
Follow these steps to assemble your MHarbor MY-378 Wearable Breast Pump before first use and after each cleaning.
- Clean and Sterilize: Before initial use, wash all components that come into contact with breast milk (flange, valve, diaphragm, collection cup) with warm soapy water and sterilize according to manufacturer guidelines (e.g., boiling, steam sterilizer).
- Assemble Valve: Ensure the silicone valve is securely attached to the bottom of the breast flange.
- Attach Diaphragm: Place the silicone diaphragm onto the top of the breast flange, ensuring a tight seal.
- Connect Motor Unit: Align the motor unit with the assembled flange and collection cup, then press firmly until it clicks into place. Ensure a secure connection to prevent air leakage.
- Charge Battery: Before first use, fully charge the pump's internal battery using the provided USB Type-C cable. The charging port is located on the side of the motor unit.

Figure 4.1: Charging the MHarbor MY-378 Breast Pump
This image displays the MHarbor MY-378 breast pump with a visible Type-C charging port and an indicator showing the 1200mAh large capacity battery charging status.
5. Operating Instructions
The MHarbor MY-378 offers four distinct modes and twelve suction levels to customize your pumping experience.

Figure 5.1: Control Panel and Mode Descriptions
This image details the control panel of the MHarbor MY-378 breast pump, illustrating the four modes (Massage, Expression, Auto, Lactation) and their respective functions, along with the twelve adjustable suction levels.
5.1. Getting Started
- Positioning: Place the assembled pump directly onto your breast, ensuring your nipple is centered within the flange tunnel. The double-sealed flange and ergonomic breast arc design provide an all-around comfortable fit.
- Power On: Press and hold the power button to turn on the pump. The screen will illuminate.
- Select Mode: Press the mode button to cycle through the four available modes:
- Massage Mode: Faster rhythm, lower suction. Designed to stimulate milk let-down and alleviate discomfort.
- Expression Mode: Slower rhythm, stronger suction. Mimics a baby's deep sucking to efficiently express milk.
- Auto Mode: Automatically cycles through massage and expression phases.
- Lactation Mode: Features a nine strong and one weak suction pattern, designed to stimulate and promote milk secretion.
- Adjust Suction Level: Use the '+' and '-' buttons to adjust the suction intensity within your chosen mode. There are 12 levels available. Start with a lower level and gradually increase to a comfortable, effective setting.
- Pumping Session: Pump until your breast feels empty or milk flow significantly slows. The pump utilizes micro-vibration technology to promote comfortable milk secretion.
- Power Off: Press and hold the power button to turn off the pump. The screen protection feature will automatically shut off the screen after 30 seconds of inactivity to conserve battery.

Figure 5.2: Bionic Intelligent Breast Pumping Mechanism
This diagram illustrates the "Baby Mouth" structure and 360-degree fit of the MHarbor MY-378, showing how it mimics a baby's horizontal sucking angle for efficient milk expression and a tight seal to prevent leakage.
5.2. After Pumping
- Carefully remove the pump from your breast.
- Pour the expressed milk into a sterile milk storage bag or bottle. The pump has a reservoir capacity of approximately 210ml.
- Disassemble all components that came into contact with milk for cleaning.
6. Cleaning and Maintenance
Proper cleaning and maintenance are crucial for hygiene and the longevity of your breast pump.
6.1. Cleaning After Each Use
- Disassemble: Separate all parts that came into contact with breast milk (flange, valve, diaphragm, collection cup) from the motor unit. The split structure design makes disassembly easy.
- Wash: Wash these parts immediately in warm, soapy water. Use a dedicated brush for cleaning pump parts.
- Rinse: Rinse thoroughly under cold running water.
- Air Dry: Place parts on a clean paper towel or drying rack and allow them to air dry completely. Do not use a cloth towel, as it may transfer germs.
6.2. Sterilization
Sterilize all milk-contacting parts at least once a day, or as recommended by your healthcare provider. Methods include:
- Boiling: Place parts in a pot of boiling water for 5 minutes.
- Steam Sterilizer: Use a microwave or electric steam sterilizer according to its instructions.
6.3. Motor Unit Care
- Wipe the motor unit with a clean, damp cloth. Do not immerse it in water.
- Keep the charging port dry and free of debris.
7. Troubleshooting
If you encounter issues with your MHarbor MY-378 Wearable Breast Pump, refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No suction or weak suction |
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| Pump does not turn on |
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| Milk leakage |
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| Unusual noise during operation |
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8. Specifications
| Feature | Detail |
|---|---|
| Model Number | MY-378 |
| Dimensions | 4.88 x 2.17 x 2.13 inches (12.4 x 5.5 x 5.4 cm) |
| Weight | 14.89 ounces (approx. 422 grams) |
| Material | BPA-free food-grade silicone, Plastic |
| Modes | 4 (Massage, Expression, Auto, Lactation) |
| Suction Levels | 12 per mode |
| Reservoir Capacity | Approx. 210ml |
| Battery Capacity | 1200mAh (implied from image) |
| Charging Port | USB Type-C |
| Noise Level | 58 dB |

Figure 8.1: Compact and Portable Design
This image demonstrates the compact size of the MHarbor MY-378 breast pump, showing it held in a hand next to a small bag, emphasizing its portability.
9. Warranty and Support
For specific warranty information regarding your MHarbor MY-378 Wearable Breast Pump, please refer to the product packaging or contact the seller directly. MHarbor is dedicated to providing practical and thoughtful products.
For further assistance or inquiries, please visit the official MHarbor store or contact their customer support.