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Journal of Human Lactation, Vol. 23, No. 1, 44-51 (2007)
DOI: 10.1177/0890334406297283
© 2007 International Lactation Consultant Association

Low Prepregnant Body Mass Index and Breastfeeding Practices

Marcello Giovannini, MD

Department of Pediatrics, San Paolo Hospital, University of Milan

Giovanni Radaelli, PhD

University of Milan, giovanni.radaelli{at}unimi.it

Enrica Riva, MD

Department of Neonatal Medicine, San Paolo Hospital, Neonatology at the University of Milan

Giuseppe Banderali, MD

Department of Pediatrics, Pediatric Day-Hospital, San Paolo Hospital, Milan

The relationship of low prepregnant body mass index with breastfeeding was investigated in 1272 women who delivered a term infant with birthweight ≥ 2500 g at the San Paolo Hospital in Milan, Northern Italy. Underweight was defined using the Institute of Medicine’s cutoff of 19.8 kg/m2. Women were interviewed via telephone through 12 months postdelivery about breastfeeding practices. Education level (high versus low, odds ratio [OR], 1.41), primiparity (OR, 1.35), vaginal delivery (OR, 0.74), and birthweight of the infant (normal versus high, OR, 1.89) were associated with low, as opposed to normal, pre-pregnant body mass index. After adjustment for these confounders, no difference was found between underweight and normal weight women for initiation or duration of breastfeeding (mean adjusted difference, 0.4; 95% confidence interval [95% CI], -0.1 to 0.9 months) or exclusive breastfeeding (0.1 [95% CI, -0.1 to 0.3] months). Underweight mothers of healthy term infants may not be at increased risk for not initiating or shorter breastfeeding.

Key Words: breastfeeding • exclusive breastfeeding • prepregnant body mass index


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