Breastfeeding, prenatal depression and children's IQ and behaviour: a test of a moderation model
Rita Amiel Castro1,2, Vivette Glover3, Ulrike Ehlert4
1Department of Clinical Psychology and Psychotherapy, Institute of Psychology, University of Zurich, Zurich, Switzerland. r.castro@psychologie.uzh.ch.
Insights
Breastfeeding is linked to higher child IQ and reduced hyperactivity, suggesting nutritional benefits. It does not moderate the effects of maternal prenatal depression on child development.
Area of Science:
- Child Development
- Neuroscience
- Public Health
Background:
- Investigating the link between breastfeeding and child neurodevelopment.
- Examining associations with intelligence quotient (IQ) and behavioral issues.
- Considering the impact of maternal prenatal depression and anxiety.
Purpose of the Study:
- Determine breastfeeding's association with child IQ and behavior.
- Assess if breastfeeding moderates prenatal depression's effects on neurodevelopment.
- Adjust for crucial prenatal and postnatal confounders.
Main Methods:
- Utilized data from the Avon Longitudinal Study of Parents and Children (n=11,096).
- Assessed child IQ via standardized testing and behavior via parent reports.
- Employed hierarchical multiple regression analysis with covariate adjustments.
Main Results:
- Exclusive and mixed breastfeeding correlated positively with IQ at 8 years.
- Exclusive breastfeeding linked to less hyperactivity at 4 years; mixed feeding to more at 9 years.
- No significant associations found between breastfeeding and emotional or conduct problems.
Conclusions:
- Breastfeeding's selective impact suggests nutritional, not psychological, benefits for neurodevelopment.
- Breastfeeding does not moderate the relationship between prenatal maternal depression/anxiety and child neurodevelopment.
- Maternal mental health and breastfeeding appear to influence child development through separate pathways.
Background:
We aimed to determine the associations between breastfeeding and children's neurodevelopment indexed by intelligence quotient (IQ) and emotional and behavioural problems through mid-childhood adjusting for prenatal and postnatal depression and multiple confounders; and to test the novel hypothesis that breastfeeding may moderate the effects of prenatal depression and anxiety on children's neurodevelopment.
Methods:
The study is based on women and their children from the longitudinal Avon Longitudinal Study of Parents and Children (n=11,096). Children's IQ was derived from standardized in-person testing; behaviour problems were assessed according to parent-report; information on breastfeeding, prenatal depression and anxiety and multiple confounders were derived from self-report questionnaires. We conducted hierarchical multiple regression adjusting for several covariates.
Results:
43% women were exclusively breastfeeding at 1 month and an additional 16.8% were engaged in mixed or partial breastfeeding. Both exclusive breastfeeding (B = 2.19; SD = 0.36, p =.00) and mixed feeding (B = 1.59; SD= 0.52; p=.00) were positively associated with IQ at 8 years of age, after adjusting for covariates. Exclusive breastfeeding was negatively associated with hyperactivity/attention deficit at 4 years (B = -.30, SD = .05; p < .01); mixed feeding was related to hyperactivity/attention deficit at age 9 (B = .20; SD = .08; p = .03) after adjustments. There was no association between breastfeeding and emotional or conduct problems. Breastfeeding did not moderate the association between prenatal depression and anxiety and children's neurodevelopment.
Conclusions:
The selective association between breastfeeding and neurodevelopmental measures suggests a nutritional rather than broader beneficial psychological effect on child neurodevelopment. Breastfeeding did not moderate the associations between prenatal depression and anxiety and child neurodevelopment, suggesting separate mechanisms of action.
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