Average Weight Gain for Breastfed Babies (Metric)

[click here for English Units (ounces/inches) and discussion]

Baby’s Age Average Weight Gain 1 Average Weight Gain 2,3
0-4 months 155 – 241 grams per week 170 grams per week †
4-6 months 92 – 126 grams per week 113 – 142 grams per week
6-12 months 50 – 80 grams per week ‡ 57 – 113 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. 1

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Sources:

  1. 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. Click here for more details on calculations [PDF file].
  2. Riordan J. Breastfeeding and Human Lactation, 3rd ed. Boston: Jones and Bartlett, 2005, p. 103, 512-513.
  3. Mohrbacher N and Stock J. The Breastfeeding Answer Book, Third Revised ed. Schaumburg, Illinois: La Leche League International, 2003, p. 148-149

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 64 mm per month

† By one year, the typical breastfed baby will increase birth length by 50% and head circumference by 33%.

Source: Mohrbacher N and Stock J. The Breastfeeding Answer Book, Third Revised ed. Schaumburg, Illinois: La Leche League International, 2003, p. 148-149.

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