... including type and dose of fertility drugs (if any),date of conception or last menstrual period, the number of GS and embryospresent, and the date of delivery, birth weight, and type of delivery. ... 38% of triplet and higher-order multiple births; ARTproduced 11% of twin births and 45% of higher-order multiple births;spontaneous conceptions accounted for 69% of twins and 17% of higher-ordermultiple ... PhDa,b,*aFertility Institute of New Orleans, 6020 Bullard Avenue, New Orleans, LA 70128, USAbSection of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Louisiana...