For a newborn baby, the amount of milk is usually around 20-30ml. If the baby is breastfed, feeding on demand is fine. Formula-fed newborns need to be fed once in 2-3 hours. For newborns around 1 week after birth, the amount of milk is around 50-60ml, for newborns around 2 weeks, the amount is around 60-90ml, and for newborns around 4 weeks, the amount is around 90-120ml. The amount of milk for newborns also varies from person to person, and is related to the weight and gestational age of the newborn at birth. Weight gain is the most objective indicator to determine if feeding is appropriate. It is normal for a newborn to gain 20-30g per day and to urinate more than 6 times in 24 hours.