These bottles are really great, they have ones with two different types of nipples. The perfe-latch is for breastfed babies which is the one that I purchased. They also have an easy-latch nipple for babies with colic. This bottle is great because when feeding your baby you don't have to worry about your baby swallowing any air and becoming gassy. My baby is exclusively breastfed, but I went back to work part-time and my baby has to take a bottle once a day while I work. She takes to the bottle better than she has with other baby bottle brands. These bottles also come in a 4oz and 8oz size which is great for growing babies!