With five small children I had the opportunity to test and re-test the bottle with the little ones and the older ones, until three or four years or so. Indeed, it is so effective that the bottles often swallow in one go and it is quite true that they avoid colic in infants. What is also significant is its ergonomics. It feels good in the hand of parents and holds well in the hands of the baby when it starts to want to drink his bottle alone. Another great benefit of the classic Advent is its large capacity that is appreciated as the child grows and needs larger amounts of milk. Finally, it is extremely strong. How many times he falls of the high chair without ever being in the least affected! The nipple is also ideal. Unlike other brands, it does not take bad taste or bad smell after a while, she remains firm and soft at the same time and is very easy to clean. This is to my knowledge the best bottle it.