Average weight gain for a breast fed baby


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

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%.

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