Decrease in weight Mothers are very concerned about the drop in the weight of newborns in about one week after birth. This is, in fact, normal in most cases. Because of the lack of regulation of neonatal feeding, the low pre-natal diet, the relatively high drop-out rate in the first days of birth, the relatively high drop-out rate through the skin and the lung, and the loss of some water meters in the body, three to four days of neonatal weight were reduced by 100 to 300 grams before birth, p...