My baby is 2 months old. her birth weight was 2.65, initially she was on BM only bt it seemed her tummy is not full. So I started formula milk with it. When I came to in law house everyone started saying she is very weak and not gaining weight, so formula milk quantity increased. Now she is almost 80 prcnt on formula and 20 on BM. my breast milk is not sufficient for her. what should I do? Is formula milk not good for her or I can continue? Please guide