My son is 7 months old and has been breastfed from birth, he has refused all bottles and screams blue murder if i/or my husband try to give him one. We are trying to introduce a bedtime cup of formula and he takes a little bit of it but he then seems to get a bit annoyed and wont take anymore. we're currently using a tommee tippee 'my first cup' which is free flow. I'm looking for a faster flowing sippy cup as i think if he can get the milk quicker he may get a bit less annoyed. Any suggestions?