Glass baby bottles from Babylife "WeeGo" are bisphenol A, phthalate, PVC and polycarbonate-free. Babylife is reintroducing glass baby bottles, but with a new design and safety twist: the bottle is covered with a modern silicone sleeve (patent pending) that will help protect the bottle from breakage and also prevent bumping into other articles in your diaper bag.The sleeve is free of plastics and is 100% non-toxic. The bottle and the sleeve can be boiled or put in the dishwasher together. The silicone nipple should be hand-washed and is also latex-free and non-toxic. The plastic ring, plug and cap contain no polycarbonates and are food grade, FDA approved and recyclable. The cap and ring should be hand washed only. The sleeve provides a good gripping surface during feeding and also a great tactile experience for your baby. The Green to Grow and Evenflo regular neck nipples work with Weego bottles.The Weego nipple is appropriate for 3-6 months. However, any other standard size nipple (not wide-neck nipples) will fit the Weego bottle. Even the Dr. Brown system will fit on the bottle if it is the standard size and you use the whole venting system on it including their collar. Includes 1 Stage 1 silicone nipple for age birth to 6 months