Newborns usually do not need a formula to determine their weight at birth; between 5-8 pounds is normal, and parents can monitor their newborns’ weight changes by plotting growth charts. Newborns are usually babies born within 28 days of each other, and there is individual variability in newborns due to differences in nutritional status and weeks of gestation. Newborn weight is an important indicator of normal growth and development, and a birth weight between 5-8 pounds is normal. Parents can place the baby on a scale and weigh it directly. You can get the newborn’s weight directly without calculating it. Usually the baby is born about 3 days, there will be a transient weight loss, this situation is normal, usually down about 5% of the birth weight. Subsequent normal diet can be quickly recovered. Parents do not need to worry. If the newborn’s weight deviates significantly from the above values, it is recommended to consult a doctor in time for nutritional intervention under the doctor’s guidance.