The new ThinkBaby 5oz polypropylene twin pack includes 2 baby bottles, 2 baby bottle nipples and 2 travel caps. The 5oz baby bottles are outfitted with slow flow cross cut nipples (designed for 0 to 3 months). The cross cut design has the benefit of being No Spill. 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.