I have just started to bottle feed breast milk to my 6 week old in preparation for returning to work, and I tried the Tommee Tippee bottles as they were advertised as being "closer to nature." But looks can be deceiving. The nipple easily inverted, which caused a lot of "dribble" mess throughout the feeding. The flow was WAY too fast, which caused a lot of tummy aches for my little boy each feeding. And I found that the bottles leak at the collar quite often, causing yet another mess each feeding. I was very disappointed with this product and will never buy a Tommee Tippee again. read full review »