TABLE 1

Breastfeeding, Hospital Admissions, and Other Characteristics in the First 8 Months After Birth

ParameterMCS (N = 15 890), % (95% CI)
Perinatal and infant characteristics
    Female49.4 (48.5–50.3)
    First-born42.4 (41.3–43.6)
    Delivered by cesarean section19.1 (18.3–19.9)
    Gestation, mean, wk40.0 (40.0–40.1)
    Birth weight, mean, kg3.45 (3.44–3.46)
    Family history of asthma25.5 (24.5–26.5)
Maternal and household characteristics
    Age at delivery, mean, y28.9 (28.6–29.1)
    Lone parent13.7 (12.7–14.7)
    White ethnicity89.1 (86.9–91.0)
    Managerial/professional occupation30.8 (28.9–32.9)
    Semiroutine/routine occupation33.7 (32.0–35.5)
    More educated (National Vocational Qualification 4/5)33.8 (31.6–36.0)
    Annual household income less than £10 40021.4 (20.0–22.8)
    Annual household income more than £52 1007.2 (5.8–8.8)
    Smoker at interview28.2 (26.9–29.6)
Infant feeding
    Ever breastfed70.5 (68.7–72.2)
    Any breast milk at 4 mo34.2 (32.1–36.3)
    Any breast milk at 6 mo24.8 (23.2–26.5)
    Any breast milk at 8 mo17.5 (16.2–18.8)
    Exclusively breastfed at 4 mo17.5 (16.2–18.8)
    Exclusively breastfed at 6 mo1.2 (1.02–1.44)
Outcomes
    Any hospital admission in the first 8 mo11.8 (11.1–12.6)
        Estimated rate for the first 12 moa17.7
    Hospital admission for diarrhea in the first 8 mo1.1 (0.9–1.3)
        Estimated rate for the first 12 moa1.6
    Hospital admission for LRTI in the first 8 mo3.2 (2.8–3.5)
        Estimated rate for the first 12 moa4.8
    Hospital admission for LRTI/wheeze3.8 (3.4–4.2)
        Estimated rate for the first 12 moa5.7
  • All percentages are weighted to allow for the stratified sample, and CIs allow for clustering. MCS indicates Millennium Cohort Study.

  • a Annual rate estimated by multiplying rate in first 8 months by 12/8.