This set contains two 260ml bottles. They are breast-shaped because babies prefer them that way. With the most natural breast-like nipple ever, this bottle contracts like a mother's breast and offers the same sensation because babies prefer it that way. The Closer to Nature bottle offers guaranteed acceptance and an anti-colic valve, making it the next best thing for your baby and making feeding easier for everyone. Features: Breast-shaped for a natural latch-on: guaranteed acceptance. Anti-colic valve in the nipple to reduce air swallowing. Soft silicone nipple with a more skin-like texture. The most nipple-like nipple with an anti-colic valve. Easy-to-latch nipple recommended by 97% of mothers. Closer to Nature bottles are compatible with all Closer to Nature teats, except the Ultra and Advanced Anti-Colic teats. Baby bottles are available in a wide range of capacities, sizes, colors and decorations.