My LO is 4 months old and doesn't eat much at all. She will only eat AT MOST 4oz sometimes. Most of the time she turns the bottle away and would rather play or sleep. I try to sometimes make her eat if I can to make sure she's getting her nutrition but it's hard when she just spits it back out. She's gaining weight but I'm just worried something is wrong. Anyone ever have this problem? Is it normal?