The Dr. Brown's Anti-Colic Options+ Newborn Feeding Set includes a multi-size pack of bottles with Level 1 and Level 2 nipples, offering slow flow for newborn feeding. The bottles feature a narrow neck design and are made of BPA-free plastic to ensure safety for babies. This set is designed to help reduce colic symptoms in infants during feeding, making it a practical choice for parents looking for anti-colic solutions for their little ones.