The genotype of the mother and the fetus influences the efficacy of a teratogen. For example, genotype determines the prevalence of cleft palate in inbred strains of mice whose mothers are administered cortisol during pregnancy.
Most women will not start ovulating in the first six weeks after giving birth.1 Breastfeeding typically delays the onset of ovulation.2 Depending on the intensity of breastfeeding, it can be several months or over a year before you regain your fertility.
When Can You Expect Your Period While Breastfeeding? Several nursing moms may restore regular menstrual flow 11 weeks after birth, while others menstruate after 24 months. Factors affecting menstruation include hormones and mothersâ nursing style differences.