my baby's weight was 3.6 kg when she was born on 6th Feb .. on 10 th feb for normal visit,her weight was 3.4 kgs .. after one month of her birth on 6th March her weight was 4 kgs.. is it normal or she has gained less weight. she is just having my breast feed milk . passing urine 7-8 times a day .. according to my pediatrician she has gained less weight. expert please suggest