Girls, hi, I have the same problem - my baby doesn't eat properly. She…

Girls, hi, I have the same problem - my baby doesn't eat properly. She eats about 100-90 grams, it's unclear what's going on. I changed bottles from the most expensive to the cheapest ones and changed her feeding position. As soon as I don't try, now the problem is that she either doesn't gain weight or gains only 10 grams in a week. She used to be able to gain at least 100 grams per week. Everyone says she's eating as much as she needs, I understand there's something else wrong. One day she ate 130-150 grams and had good bowel movements, but now she