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Home > Health Library > Physical Growth in Newborns
In the first month, your doctor will pay close attention to your baby's increasing weight, length, and head circumference, which is measured around the largest point of the head, usually starting at a point on the forehead.
The average birth weight for babies is around 7.5 lb (3.5 kg), although between 5.5 lb (2.5 kg) and 10 lb (4.5 kg) is considered normal. In general:
Newborns often lose around 8 oz (226.8 g) in the first 4 to 5 days after birth but regain it by about 10 to 12 days of age. In the first month, the typical newborn gains about 0.7 oz (20 g) a day, or about 4 oz (110 g) to 8 oz (226.8 g) a week.
The average length of full-term babies at birth is 20 in. (50 cm), although the normal range is 18 in. (45.7 cm) to 22 in. (60 cm). In the first month, babies typically grow 1.5 in. (4 cm) to 2 in. (5 cm).
Your baby's head will grow at its fastest rate during the first 4 months after birth than at any other time. This increase is due to rapid brain growth. The average head circumference at birth is about 13.5 in. (34.5 cm). By the end of the first month, it increases to about 15 in. (37.6 cm).
Many babies look a little less than perfect in the first few days or weeks after birth. Gradually they will gain that cute and healthy baby look. Do not be alarmed if your newborn has:
Other physical developmental issues to be aware of in your baby's first month include:
Current as of:
September 20, 2021
Author: Healthwise StaffMedical Review: Susan C. Kim MD - PediatricsKathleen Romito MD - Family MedicineJohn Pope MD - Pediatrics
Current as of: September 20, 2021
Author: Healthwise Staff
Medical Review:Susan C. Kim MD - Pediatrics & Kathleen Romito MD - Family Medicine & John Pope MD - Pediatrics
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