My daughter will be 1 year and 4 months now. She has been always under weight from birth, but not much. Today her weight will be around 7.3 to 7.5 Kg. When she was 3 month old her Pediatrician doctor asked my wife to give powder milk. I refused to give powdered milk and impose more for mother milk. She is super active all the time. She is so adorable that she has never troubled or any issue. Only thing is her mother thinks she is under weight which always has negative impact in her mind.