my baby was 9 months old her birth weight is 3.44 now she is 5.9 kg. i consult doctor urine test, blood test, thyroid test, NBS test, vitamin b12 tests are testing. in this reports vitamin b12 is low and remaining reports are normal. i use supplements for b12. and I tried to give better food . and also consult nutrition she said that you take animal milk she can't digest that protein in animal milk you don't take animal milk related products also but my baby does not weight gain . my baby is not try to sit. now she is crawling with her stomach. i am very fear about her