TABLE 1.

Gains in Weight and Length of Breastfed and Formula-Fed Infants From 8 to 42 and 42 to 112 Days of Age

Feeding GroupGenderNumber of Subjects8–42 days42–112 days
Gain in Weight, g/dGain in Length, mm/dGain in Weight, g/dGain in Length, mm/d
MeanSDMeanSDMeanSDMeanSD
BreastfedMale20338.99.71.290.2225.46.20.960.17
Formula-fedMale38039.87.71.330.2228.56.41.030.12
BreastfedFemale21633.89.31.240.2222.66.30.890.13
Formula-fedFemale34033.37.41.250.1924.75.20.940.11
  • Gains in weight and length from 8 to 42 days of age were similar for breastfed and formula-fed infants; gains from 421 to 112 days were greater (P < .001) by formula-fed than breastfed infants. SD indicates standard deviation. The table was modified from Nelson et al.1