The MAM Easy Start Anti Colic 3 Bottle Set includes 9oz bottles suitable for babies 2 months and up. These wide neck bottles feature anti-colic nipples that reduce air bubbles and simulate breastfeeding, making them easy to combine with breastfeeding. The bottles are made of BPA-free plastic and come with features such as easy cleaning removable bases, a smooth flow, and a travel-ready sterilizing feature.