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| Quick reference medical handouts used
by Pediatric offices |
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Tables of Normal Growth
It is important for parents to be knowledgeable about normal growth.
The average birth weight for a full term infant is 7 lbs 4 oz or 3.3
kilograms. Probably as a result of loss of excess fluid, weight drops up
to 10% in the first week of life; birth weight should be regained by two
weeks of age. Breastfed infants tend to regain birth weight a little later
than bottle fed infants.
On average, infants gain about 1 kilogram per month for the first
3 months, ½ kilogram per month from 3-6 months of age, 1/3 kilogram
per month from 6-9 months of age and ¼ kilogram per month from 9-12
months of age. Full term infants double their birth weight by 4 months of
age and triple it by 12 months of age.
Average Daily Weight Gain
Age |
Ounces |
Grams |
0-3 months |
1 oz |
26-31 gm |
3-6 months |
1/2 oz |
17-18 gm |
6-9 months |
1/3 oz |
12-13 gm |
9-12 months |
1/4 oz |
9 gm |
1-3 years |
1/4 oz |
7-9 gm |
4-6 years |
1/8 - 1/4 oz |
6 gm |
Average Monthly Weight Gain
Age |
Pounds |
Kilograms |
0-3 months |
2.2 lbs/mo |
1 kg/mo |
3-6 months |
1.1 lbs/mo |
1/2 kg/mo |
6-9 months |
3/4 lb/mo |
1/3 kg/mo |
9-12 months |
1/2 lb/mo |
1/4 kg/mo |
Average Yearly Gain In
Length
Year |
Inches |
Centimeters |
| 1st year |
9 in/yr |
25 cm/yr |
| 2nd year |
4.5 in/yr |
12.5 cm/yr |
3yrs - puberty |
2 in/yr |
5-6 cm/yr |
| puberty |
4.5 in/yr |
12.5 cm/yr |
The average head circumference at birth is 13.5 inches or 35 centimeters
and increases rapidly to 18.5 inches or 47 centimeters by 1 year of age;
the rate of growth then slows down reaching an average of 21.5 inches or
55 centimeters by 6 years of age.
As a reminder, this information should not be relied on as
medical advice and is not intended to replace the advice of your child’s pediatrician.
Please read our full disclaimer.
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