Breastfeeding Inversely Linked to Infant BMI Z Score

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Breastfeeding Inversely Linked to Infant BMI Z Score
Breastfeeding Inversely Linked to Infant BMI Z Score

WEDNESDAY, Oct. 3, 2018 (HealthDay News) -- Breastfeeding is inversely associated with body mass index z scores (BMIzs) measured at 12 months, and the association is attenuated with formula supplementation by six months, according to a study published online Sept. 24 in Pediatrics.

Meghan B. Azad, Ph.D., from the University of Manitoba in Winnipeg, Canada, and colleagues examined breast milk feeding, type of supplementation, and feeding in hospital in 2,553 mother-infant dyads.

The researchers found that 97 percent of the mothers initiated breastfeeding, with a median breastfeeding duration of 11 months. Seventy-four percent of the infants received solids before six months. Overall, 55 and 27 percent of "exclusively breastfed" infants received some expressed breast milk and briefly received formula in hospital, respectively. Higher BMIzs were seen in association with all feeding styles compared with exclusive direct breastfeeding at three months (adjusted β, +0.12 for some expressed milk, +0.28 for partial breastfeeding, and +0.45 for exclusive formula feeding). These associations were not altered by brief formula supplementation in hospital, as long as exclusive breastfeeding was established and sustained for at least three months. Formula supplementation by six months, but not solid food supplementation, was associated with higher BMIzs (adjusted β, +0.25). Similar results were seen for weight gain velocity.

"This study provides new evidence to inform feeding recommendations and guide further research about infant feeding practices and how they influence the development and prevention of childhood obesity," the authors write.

One author disclosed ties to the infant nutrition industry.

Abstract/Full Text

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