[click here for English Units (ounces/inches) and discussion]
| Baby’s Age | Average Weight Gain | |
| 0-4 months | 155 – 241 grams per week | |
| 4-6 months | 92 – 126 grams per week | |
| 6-12 months | 50 – 80 grams per week ‡ | |
| † It is acceptable for some babies to gain 4-5 ounces (113-142 grams) per week.
‡ The average breastfed baby doubles birth weight by 3-4 months. By one year, the typical breastfed baby will weigh about 2 1/2 – 3 times birth weight. . Sources: World Health Organization Child Growth Standards, 2006. Available at: http://www.who.int/childgrowth/en/. To figure average weight gain, we used the weight-per-age percentile charts for birth – 5 years. The range is a combination of boys and girls 5% to 95%, rounded to the nearest 5 grams. |
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| Baby’s Age | Avg. Length Increase | Avg. Head Circumference Increase |
| 0-6 months | 2.5 cm per month | 1.27 cm per month |
| 6-12 months † | 1.27 cm per month | 6.4 mm per month |
| † By one year, the typical breastfed baby will increase birth length by 50% and head circumference by 33%.
Source: Mohrbacher N. Breastfeeding Answers Made Simple, Amarillo, Texas: Hale Publishing, 2010, p. 205. |
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