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The influence of breast-feeding on behavioral development is uncertain. Investigators in the U.K. used data from a large national cohort to examine the association between duration of breast-feeding and parent-reported behavioral development in 9525 term and 512 preterm singleton white infants born in 2000–2001. Parents (mostly mothers) were surveyed about feeding history when infants were age 9 months and completed the Strengths and Difficulties Questionnaire (SDQ) to assess their child's behavior at age 5 years.
Overall, 29% of term and 21% of preterm infants were breast-fed for ≥4 months. Nearly 12% of term and 15% of preterm children had abnormal SDQ scores at age 5 years. In logistic regression (adjusted for demographic and socioeconomi…