I had use this bottle for my twins daughters from the 1st month of their birth. As they are twins, we have to give them formula milk which is hectic to give with spoon so I prefer Philip avent bottle. It works great, nipples shape and the material is so good that children easily drink it from it and even washing of the bottle is too easy which I feel relax. Baby also happy with it. I have nearly use it for 2 years for my daughters. Thanks Phillips avent for such bottle. I also suggested many moms.