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.
â whether or not your baby is taking solids. â whether or not your baby is using a pacifier. â your own personal body chemistry. While you are breastfeeding, if your period does return, it may not be regular. It is not unusual for a womanâs cycle to go quicker or slower than normal while she is breastfeeding. Sometimes, a woman who is breastfeeding will skip periods altogether, or have months in between periods.