Maternal factors influencing the occurrence of low birthweight in northern Vietnam.

The relationship between the birthweight of newborn infants and their mothers' health characteristics as well as socio-economic status were studied in 1474 consecutive deliveries from eight areas in the delta region of north Vietnam. The results showed that the proportion of low birthweight (LBW) infants varied from 7.9% to 12.5%. Body mass index (BMI) of the mothers, good nutrition during pregnancy and maternity leave before delivery were negatively associated with the occurrence of LBW. The association between chronic energy deficiency (low BMI) and LBW was seen only among the farming women. Measures should be taken to reduce the workload and to supply sufficient food for pregnant women, and special priority should be given to rural areas.