TABLE 2

Developmental Delay at 9 Months of Age According to the Duration of Breastfeeding Among 15 522 Infants From the MCS

Breastfeeding PatternnaGross Motor DelayFine Motor Delay
ProportionbOR (95% CI)ProportionbOR (95% CI)
1. Never breastfed526410.71.007.41.00
2. Short duration41488.40.77 (0.66–0.90)6.00.80 (0.65–1.00)
3. Intermediate duration13897.90.71 (0.56–0.91)5.30.71 (0.52–0.96)
4. Prolonged partial23328.20.75 (0.61–0.92)4.70.62 (0.47–0.82)
5. Prolonged exclusive23897.30.66 (0.54–0.79)5.40.72 (0.58–0.89)
Linear trend testP < .00005P = .0003
  • CI indicates confidence interval.

  • a Actual (unweighted) sample size.

  • b Weighted percentages.