Abstract
Three hundred and thirty-four multiple pregnancies occurred in 31,131 total deliveries, an incidence of one in 93.4 for twins, and one in 15,514 for triplets.The average birth weight is 2,391 Gm. for an infant which is one of twins and 3,405 Gm. for other infants born in this hospital.The average length of gestation is 256 days in twin pregnancies, 281 days in all other pregnancies in this hospital.The combined fetal and neonatal death rate for 660 reportable twin infants is 13.3 per cent; for twin infants over 1,000 Gm. it is 8.4 per cent. The total hospital mortality for reportable births is 4.4 per cent.The incidence of hypertensive, pre-eclamptic and eclamptic toxemia among twins is more than three times that found in single pregnancies.Prematurity is the outstanding cause of death in twin infants. Maternal complications are probably not an important factor in producing fetal death.In this series the second born twin does not appear to have an increased birth hazard.
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