My baby is 3.5 months age, her weight is 4.20 kg Is there any problem Baby birth weight is 3.28 but she has reduced to 3 kg and not gained weight till 1 and half month

A. Hai good evening !! In the initial weeks weight reduction is normal but they regain within a month. Yes according to birth weight baby present weight 4.2 kg for 3.5 months is under weight.. Check if baby is getting enough feed and good sleep.. Give breast milk or formula milk every two hours burp well . Massage daily this helps in good sleep 14-18 hours sleep impacts on growth harmone.