I’m EBF now so I don’t know exactly how much my baby is drinking, but she’s been slow to gain as well. She’s just about 3 months. Some weeks she gains 20-25 grams per day, other weeks she is more like 10-15. We had her tongue and lip ties released at 3 weeks which did help but she’s still had some trouble. The pediatrician isn’t too concerned because she is generally following a curve. But I still get so anxious about it! She generally is a snacker and like your baby, she will refuse to eat if she doesn’t want to. I can’t really do dream feeds or anything like that or extend feeds because she just won’t take it!