‎Safe in microwave, boiling water, dishwashers and sterilizers.

Comotomo baby bottles are deisgned to most closely mimic breastfeeding to reduce bottle rejection and nipple confusion issues Ultra wide-neck design allows easy cleaning by hand without a brush. Nipple and body is made of 100% safe hygienic silicone Safe in microwave, boiling water, dishwashers and sterilizers. Tips - If the bottle is leaking,make sure there's not blockage on the vents. You can wash it in running water, or sterilize it in boiling water for 5 minutes.Also,make sure that the nipple, ring, and bottle base is aligned properly and screwed tightly and thoroughly