Maternal asthma, infant feeding, and the risk of asthma in childhood

Wendy H Oddy1, Jennifer K Peat, Nicholas H de Klerk

  • 1Centre for Child Health Research, University of Western Australia, Telethon Institute for Child Health Research, Perth, Australia.

Insights

Exclusive breast-feeding for less than four months increases the risk of childhood asthma. Maternal asthma status does not alter this association, suggesting all infants benefit from prolonged exclusive breastfeeding.

Area of Science:

  • Pediatric Allergy and Immunology
  • Epidemiology
  • Public Health

Background:

  • Maternal asthma is a known risk factor for childhood asthma.
  • The role of breastfeeding in mitigating this risk is debated.
  • Previous studies have yielded conflicting results regarding breastfeeding and childhood asthma.

Purpose of the Study:

  • To investigate if maternal asthma modifies the association between breastfeeding duration and childhood asthma.
  • To determine the optimal duration of exclusive breastfeeding for preventing childhood asthma.
  • To clarify breastfeeding recommendations for infants with a maternal history of asthma.

Main Methods:

  • A prospective cohort study of 2602 West Australian children, enrolled before birth.
  • Data collected on infant feeding, maternal asthma, atopy, and physician-diagnosed asthma at age 6.
  • Statistical analysis using logistic regression to assess risk factors and interactions.

Main Results:

  • Stopping exclusive breastfeeding before 4 months was associated with an increased risk of childhood asthma (OR, 1.28; P=.038).
  • This increased risk was not modified by maternal asthma status or child's atopy.
  • Exclusive breastfeeding for less than 4 months remained a significant risk factor for current asthma after covariate adjustment (OR, 1.35; P=.049).

Conclusions:

  • Maternal asthma status does not alter the association between breastfeeding duration and childhood asthma.
  • Exclusive breastfeeding for at least 4 months is recommended for all infants, regardless of maternal asthma history.
  • Prolonged exclusive breastfeeding may be a protective factor against childhood asthma development.

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