Underweight and Obesity in Low Birth Weight Children in Early Infancy in Japan

Rena Kato¹, Masaru Kubota¹, Hiromi Saito¹, Yukihiro Takahashi²

¹Department of Human Life and Environment, Nara Women’s University, Nara, Japan.
²Department of Neonatal Intensive Care Unit, Nara Medical University Hospital, Nara, Japan.

DOI: 10.4236/fns.2015.63034                

Abstract

Introduction: Although there are several reports on the prevalence of underweight or obesity in low birth weight (LBW, <2.5 kg) children, there are few longitudinal studies from birth to early infancy. Methods: We enrolled 177 (93 boys) LBW and 2485 (1267 boys) normal birth weight (NBW, ≥2.5 and <4.0 kg) children. Height and weight data at birth and at 1.5, 3.5, and 5 years were obtained from mother-health child records. Underweight and obesity were defined as <5^th percentile and ≥90^th percentile of the body mass index (BMI), respectively, based on reference values for Japanese children. Results: LBW children had accelerated growth from birth to age 3.5 years, but at Age 5, both sexes had significantly lesser height and weight z-scores, with notably lesser BMI percentile scores for girls, compared with NBW children. The prevalence of underweight was significantly higher in the LBW children throughout the study period. There were no significant differences in the prevalence of obesity between the two groups, except for at birth. Multiple regression analysis revealed that small-for-gestational age was associated with underweight at Age 5 years. Conclusions: This study indicates that, up to Age 5, underweight is a more serious problem than obesity in LBW children. Our results suggest that careful observation of growth from early infancy is necessary to prevent the occurrence of underweight in early infancy.

Keywords

Growth, Low Birth Weight, Obesity, Small-for-Gestational Age, Underweight

Conflicts of Interest

The authors declare no conflicts of interest.

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