The Tommee Tippee worked for my little guy. He is my third, so I had tons of kinds of bottles already, when I went back to work, he was 4 1/2 m, he refused to take a bottle. I got the Tommee Tippee and he took it better than the others...though it still took some time. He takes it fine now, but only after I used it to feed him a number of times. It seems to be more the association with mom and mom's smell, cuddle and warmth than the actual bottle nipple. Good Luck!!