Support for your
WONDBORN Portable Breastmilk Cooler

Hand wash with warm water and a neutral detergent. Don't use high-temperature
sterilization methods for this batch. Please avoid dishwashers, steam sterilizers, UV or drying sterilizers, and boiling, as heat may affect material stability and cause deformation.
If the bottle cap does not close properly, please contact support@wondborn.com. After confirmation, we will provide a free replacement set (one-time per order).

After each use:
1. Disassemble all parts (bottles, ice rings, silicone parts, cup body)
2. Wash with mild detergent
3. Wipe dry or air dry
4. Reassemble only when fully dry

Total capacity is 22 oz (approx. 660 ml), including two separate 11 oz (approx. 330 ml) bottles, suitable for daily use or multiple pumping sessions.

The cooler's dimensions are approximately 6.50 × 6.38 × 10.63 inches, and it weighs about 3.34 pounds (including the frozen cooling tube). The product uses a vacuum-insulated design and 360° thermal insulation system for longer cooling performance, which makes it slightly heavier than standard storage cups.

Yes, it is designed to be travel-friendly. TSA regulations permit you to bring breast milk in reasonable quantities through airport security. This ice-free portable cooler for breast milk makes the screening process smooth and straightforward. We recommend keeping your milk in the cooler to present it to TSA agents separately from your other liquids.

Freeze at -18°C (0°F) for at least 12 hours before use for optimal performance. The cup body does not require refrigeration and can be stored at room temperature.

With 4 fully frozen ice rings and the cup kept closed, it can safely keep contents chilled for up to 30 hours. Actual duration may vary depending on ambient temperature and how often it is opened.

When fully frozen and kept closed, the system maintains temperatures below approximately 40°F (4°C).
Flexible combinations depending on use case:
1 ice ring + 1 bottle: short trips (approx. 12 hours)
2 ice rings + 1 bottle: full-day use (approx. 27 hours)
3 ice rings + 2 bottles: overnight or long trips (approx. 17 hours)
After use, refreeze the ice rings for reuse.

Please first check our How-to Videos or FAQs for basic troubleshooting.
If the issue persists (missing parts, damaged accessories, cooling performance concerns, or usage questions), contact support@wondborn.com.
We offer a one-year warranty for your peace of mind.