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Baby weight at birth related to maternal characteristics, infants are more likely to have an average weight of 2500 grams or more if the 20-34 year-old mother gave birth to her first child when the time, the data IDHS showed 74.3 percent prevalence rate. On the whole the same source reported 6 percent of babies had birth weight less than 2500 grams. Several studies on the impact of the work done by the pregnant woman to the fetus have been carried out, including studies conducted by Manshande et al., (1987) who compared pregnant women who perform heavy physical activity in the last week of pregnancy in pregnant women who do not perform physical activity (breaks) in the last weeks of pregnancy. In this study it was reported that all infants born full-term and the long break has a strong influence on birth weight infants, where there is an increase in birth weight of 334 grams on the baby girl, but there was no difference in the birth weight of a baby boy. The research objective consists of the general objective is to determine whether or not the relationship type of physical labor for expectant mothers with a birth weight babies in hospitals Prof. DR. W.Z.Johannes Kupang in 2010. This research is explanatory research with design Cross-sectional Study. The study population is all the mothers in hospitals inpartu Prof. DR. Kupang WZJohannes May to October 2010 was 917 people (Register childbirth, 2010), the study sample inpartu some mothers who met the inclusion criteria, among others, mothers with spontaneous labor, action and artificial, and the exclusion criteria were mothers with twin births, diabetes mellitus and mother to smoking.The sampling method is non-probability sampling, with Porposive sampling techniques, sample size of 50 people. The results that most of the respondents who do strenuous activity during pregnancy give birth to babies with birth weight 2500-4000 grams (82%). Respondents who had parity ≤ 4 (84%) gave birth to infants with birth weight 250