For the last 6 years, I been purchasing Dr. Brown bottles. I have three kids and they all used Dr.Brown bottles. My youngest who is now 3 months old is using Dr. Brown. Dr.Brown bottles help reduce air bubbles. This helps prevent spit-ups in babies. The bottles are great because the nipples are available in all stages from newborn to toddler. These bottles also do not leak, which is a BIG PLUS !! These bottles are definitely worth the price. I highly recommend them for all babies.