Physical Growth in Newborns
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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 around7.5 lb (3.5 kg), although between 5.5 lb (2.5 kg) and10 lb (4.5 kg) is considered normal. In general:
Newborns often lose around8 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 about0.7 oz (20 g) a day, or about 4 oz (110 g) to8 oz (226.8 g) a week.
The average length of full-term babies at birth is20 in. (50 cm), although the normal range is 18 in. (45.7 cm) to22 in. (60 cm). In the first month, babies typically grow1.5 in. (4 cm) to2 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 about13.5 in. (34.5 cm). By the end of the first month, it increases to about15 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:
Primary Medical Reviewer Susan C. Kim, MD - Pediatrics
Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer John Pope, MD, MPH - Pediatrics
Current as ofMay 4, 2017
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