I have been using the soothie bottles from the time my baby girl came out of the hospital. It was very difficult for my baby to adjust to any bottles since I was also breat feeding. The shape of the nipple on the soothie bootle make it easy for the baby to transition from breast feeding to bottles. I highly recommend this brand of bottles to all mothers. I also like the fact that it comes in different styles colors and characters. I personally had the winnie the pooh bottles and my daughter loved them. What also sold me on the product was the fact that the nipples and the pacifiers are the same...