Of every 100 babies born, one is likely to weigh ten pounds or morebig enough to cause obstetric difficulties unless the mother's pelvis happens to be extra large. Doctors do not know why some babies are born big, but they are convinced that mothers cannot control the size of their offspring by going hungry. Heredity and other more obscure factors are probably involved.
For some reason, the more children a mother has already had, the more likely she is to bear a big baby. Dr. William Davis Hawker of St. Louis checked the weights and family rank of 8,890 children born at...
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