Irregular menses--overripeness and fetal anomalies.
D000367:Age Factors; D000818:Animals; D000013:Congenital Abnormalities / Q000209:etiology*; D010064:Embryo Implantation; D005260:Female; D005306:Fertilization; D008599:Menstruation Disturbances / Q000150:complications*; D010060:Ovulation; D010063:Ovum; D051381:Rats; D013997:Time Factors