It is normal for newborns to lose up to 10% of their body weight by excluding meconium and water during the first 3 days of life (up to 5% for formula-fed babies).
Weight gain begins at 4-6 days (after mother breastfeeds) and should be able to return to birth weight by 2 weeks.
In general, from birth to 3 months, the average weekly weight gain is 150-200 grams; 3-6 months, the average weekly weight gain is 100-150 grams; 6-12 months, the average weekly weight gain is 70-90 grams.
Weight gain should be based on a 4-week average, because whether the baby has urinated, or has diarrhea, or whether he has just drank milk, whether he is ill, or whether he has a bad appetite in the past two days will affect the baby’s weight. So to see the baby’s weight gain should look at the 4-week average weight gain.
In the first year, the body weight is about 6 kg. In the first year, the height should also grow about 25 cm.
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