This cup is absolutely amazing!! I breast feed my son, but also tried to give him expressed milk out of a bottle once a day to get him used to it for times that I need to leave him. He was very reluctant to drink from a bottle and at 6 weeks old he totally rejected it - he would scream the house down if a bottle teat went anywhere near his mouth!! At 7 weeks old I tried him out on the doidy cup and by my third attempt to feed him with the doidy cup (at 8 weeks old) he had learnt to sip from the cup. He's been drinking from the cup once a day since then and on a few occasions I've left him for about 6 hours at a time alone with his dad and they've got on well with the doidy cup. He's now 4 months old and holds the cup himself. His co-ordination is not great so he still needs a bit of guidance to get the cup to his mouth, but it's great that he can control the pace of drinking himself now. It is quite messy using the doidy cup though, especially now that my son wants to hold the cup himself. He usually needs a change of top after each feed no matter how many and what type of bib I use. I think it's worth it though, as with a doidy cup you can skip out bottles and beakers with spouts altogether. I'd definitely recommend it, especially for breast feeding mums who may occasionally need to leave their baby with someone else.