|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.
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.
|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.