My baby is 23 days old and her weight is not increasing that much

A. Hai good evening !! Generally babies reduce their birth weight by 1-2 weeks and later by 3-4 weeks regain,on an average baby increase 400-700gm per month. The ideal weight of one month old baby should be 2.8 - 4 kg. Give frequent feeds every two hours and whenever baby demands , check if Baby sleeping 16-18 hours a day.