8-10 oz (236-300 ml). Pediatrician recommended. Clinically shown: mimics breastfeeding; significantly reduces gas and colic. BPA Free: Bisphenol-A free. Pre-Sterilized Disposable Liners keep air out for more comfortable feeding. feeding. Most like mother. Generations of moms have trusted the Playtex Drop-Ins System with their babies, and it continues to be the No. 1 selling bottle system (based on sales volume). It is also pediatrician recommended. Two clinical studies confirm that the Playtex Drop-Ins System provides significant colic reduction and mimics the natural feeding patterns of breastfeeding: Clinically shown reduces 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 and 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. 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 & freeze directly in the liner. Playtex Drop-Ins disposable liners are: Pre-sterilized for a clean bottle any time; 100% leak-proof; pre-formed for easy one-handed assembly and clean-up; bisphenol-A free (BPA-free) and phthalate-free. Manufactured to Playtex quality specifications. Made in China.