Time of fertilisation and sex of infants.
D003456:Cryptorchidism / Q000453:epidemiology; D005260:Female; D005306:Fertilization; D006062:Gonadotropins / Q000378:metabolism*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D012621:Seasons; D012744:Sex Ratio
D006062:Gonadotropins