The new ThinkBaby Starter Set is the perfect gift for any new parent. The set includes 4 baby bottles and six nipples. Two 5oz baby bottles are outfitted with slow flow cross cut nipples (designed for 0 to 3 months). The set also contains 2 polypropylene 9oz baby bottles with medium flow nipples (designed for 3 to 6 months). And finally ThinkBaby has included 2 fast flow nipples (designed for 6 to 12 months). The nipples feature ThinkBaby s simple one-piece, anti-colic design. Anti-colic systems help reduce the incidence of gas and spit up by reducing the vacuum pressure created while your child is drinking. The unique system is easy to clean (dishwasher safe, top rack) with no extra parts to worry about. All ThinkBaby products are free of bisphenol-A (BPA), nitrosamines,PVC, lead, phthalates, melamine, and biologically harmful chemicals.