If anyone has problems with tummy pains I can't recommend Dr Browns bottles enough. I was using tommee tippee bottles but it just allows them to gulp and swallow so much air. After 2 days of using it along with Infacol at the beginning of the feed and 1ml of gripe water a couple of times a day at the middle/end of the feed he finally didn't have 1 pain last night. So if your baby is screaming,wiggling in pain go get the bottles they are huge but really work X