I stuck with Enfamil for both, so she was on Enfamil Gentlease and then we switched her to Enfamil Lactose Free. I offered her a top up (old formula) at 7:30pm before bed and she was having none of it. She always acts like she wants to eat, sees the bottle and opens her mouth, sucks vigorously for about 10 seconds and then just stops, spits it out and refuses any more.
So in 12hrs today she had 14.5oz and she normally does 1 NF, so if she does say 4oz tonight then she'd be at 18.5 in 24hrs when she used to be having 25-30oz. I really don't think it's the flow but I will try some faster nipples to rule it out.