Your Original Nurser Gift Set Includes: 1 - NaturaLatch latex nipple (slow flow); 1 - NaturaLatch latex nipple (fast flow); 1 - NaturaLatch silicone nipple (slow flow); 1 - NaturaLatch silicone nipple (fast flow); 1 - orthodontic latex nipple (medium flow); 3 - 8 to 10 oz original Nursers; 2 - 4 oz original Nursers; 5 - 4 oz. Drop-Ins pre-sterilized pre-formed disposable liners; 5 - 8 to 10 oz Drop-Ins Pre-sterilized & pre-formed disposable liners; 5 - self storing leak-proof caps; 5 - retainer rings; 1 - instruction booklet. Pediatrician recommended. Clinically shown: mimics breastfeeding; significantly reduces gas and colic. Bisphenol-A free. BPA free. Pre-sterilized disposable liners keep air out for more comfortable feeding. The Playtex Drop-Ins System is designed to help baby switch between breast and bottle. Patented NaturaLatch Nipple: Clinically shown to mimic baby's latch-on like the breast; Slow-flow nipple designed to replicate the natural flow of the breast, so baby takes in the right amount. Compatible with the Playtex Nursing Necessities Breast Pumps: Just pump, store and feed using the One Step Breast Milk Storage Kit (Sold separately); Easy to store and freeze directly in the liner. Playtex Drop-Ins Disposable Liners are: Pre-sterilized for a clean bottle any time; 100% Leak-proof guarantee; Preformed for easy one-handed assembly and clean-up; Bisphenol-A free (BPA-Free). Generations of moms have trusted the Playtex Drop-Ins System with their babies, and it continues to be the no. 1 Selling Bottle System in. It is also pediatrician recommended. Two recent clinical studies confirm that the Playtex Drop-Ins System provides significant colic reduction and mimics the natural feeding patterns of breastfeeding. Clinically Shown to Reduce Gas and Colic: In a clinical study. 8 out of 10 mothers indicated that their babies showed fewer signs of gas, colic and other feeding discomforts. Clinically shown to Support Baby's Own Natural Feeding Pattern and Support Breastfeeding: Baby sucks & swallows in a coordinated rhythm that is similar to how they feed from the breast; Baby breathes more naturally; Baby can control the flow of milk, so he/she takes in just the right amount. Made & assembled in USA. Latex nipple made in Mexico. Nipple ring made in China. Orthodontic nipple made in Malaysia. Pacifier made in China.