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.  Dual anti-colic vents prevent unwanted air-intake and reduce colic.  Ideal for breastfed babies