My baby girl is 4 months old and her weight is only 6.5kg while at the time of birth her weight was 4kg.... So I m worried.. She is not gaining appropriate weight..what should I do?

Relax... It's fine... Just keep breast feeding... She will gain weight... And if the baby is active then weight doesn't matter.

Understanding Baby Weight Gain

Baby Weight Gain: What Helps And How

Normal Newborn Baby Weight Gain Trajectory And Milestones

Well it's a good weight for 4 months, relax and enjoy your baby.

It's fine. .growth is ok