These Hegen Anti-Colic Baby Bottles ($38 for two) feature an off-center nipple to mimic a breast, anti-colic vents to reduce backflow and gas, and come in a unique square design that make them easier to stack in storage and for babies to hold. The bottles also come in bundles — like this one, which includes different bottle sizes and a manual breast pump attachment — and can be used long after baby is done drinking from a bottle as snack containers thanks to the brand's container lids.