Hi,I just recently had a baby girl who is 5 wee...

Hi,I just recently had a baby girl who is 5 weeks this week, she is havig so much trouble putting weight on.i have increased her bottle to 120mls but she gets to 60mls and falls asleep and i cant wake her up for more. I noticed while shes feeding with the bottle shes has a twitch in her belly and it also makes a sound like her belly is empty.Im just worried she wont put any weight on.I changed her feeds from 4 hrs to 3 hrs.Has anyone eles had this problem?