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Updated: Feb 20, 2026

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La lactancia materna modera la asociación entre el nivel socioeconómico familiar y las puntuaciones de comportamiento

Sarah E Turner^1,2,3, Leslie Roos^4,5, Nathan C Nickel^1,2,3,4,6

¹Manitoba Interdisciplinary Lactation Centre (MILC), Winnipeg, MB, Canada.

Frontiers in public health

|February 19, 2026

Abstracto

Background:

Children living in low socioeconomic status (SES) environments are more likely to develop behavior problems. Breastfeeding is one behavior that has been positively linked to mental health throughout childhood. We investigated whether breastfeeding modifies the association between low SES and behavior problems.

Methods:

We studied a subset of the Canadian CHILD cohort (N = 2,342). Lower SES (n = 592) was defined as one or more of: (1) low income based on family size, (2) single parenthood, or (3) maternal education below a post-secondary degree. Breastfeeding was reported by caregivers from birth to 2 years. The Child Behavior Checklist (mean 50, SD (10), comprising internalizing, externalizing, and total behavior scores) was administered at 5 years. We tested main effects and interactions between SES and breastfeeding on child behavior, adjusting for several maternal and child characteristics.

Results:

Lower SES was related to higher (worse) behavior scores (B = 2.06 [95%CI: 1.06, 3.07] for total behavior scores), while longer and more exclusive breastfeeding was related to lower (better) behavior scores (B = -2.43 [95% CI: -3.74, -1.11] for exclusive breastfeeding at 6 months, compared to no breastfeeding, for total behavior scores). We observed significant interactions between longer and more exclusive breastfeeding and family SES on internalizing and total behavior scores, indicating that the "socioeconomic gap" in behavior scores becomes smaller with more exclusive and longer breastfeeding.

Conclusion:

This study provides new evidence that breastfeeding may be one factor that can help reduce socioeconomic inequities in child behavior scores.

Palabras clave:

Lista de verificación de comportamiento infantil (CBCL)lactancia materna cohorte nivel socioeconómico familiar interacción

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