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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
The average birth weight for babies is around
7.5 lb (3.4 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 (19.8 g) a day, or
about 4 oz (113.4 g) to
8 oz (226.8 g) a
The average length of full-term babies at birth is
20 in. (50.8 cm), although the
normal range is 18 in. (45.7 cm) to
22 in. (55.9 cm). In the first
month, babies typically grow
1.5 in. (3.8 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. (34.3 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:
February 2, 2011
Susan C. Kim, MD - Pediatrics & Thomas Emmett Francoeur, MD, MDCM, CSPQ, FRCPC - Pediatrics
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