Natural family planning, also called the fertility-awareness method or rhythm method, take into account a woman's menstrual cycle so that sex can be avoided or alternate methods of birth control can be used on days when the woman is most fertile (Greenberg, 2013). Facts used in the rhythm method include the fact that the egg only survives for about one day and sperm can stay alive for about six days inside of a woman (Greenberg, 2013).
Approx birth month. First month is the month they're conceived and the one beside it is the approximate month of birth, if they're born full term. Handy guide if you want to try to have a baby in a specific month.