It is also possible to be pregnant while breastfeeding with milk, and milk production will decrease after pregnancy. During breastfeeding, although menstruation has not yet recovered, the possibility of ovulation cannot be ruled out. Because the ovarian function has not been fully restored during breastfeeding, menstruation is irregular, so ovulation is also irregular. It is advisable to take contraceptive measures when having sex during breastfeeding to avoid unplanned pregnancy, which will affect the health of the breastfeeding mother and also the baby’s breastfeeding due to the decrease in milk secretion. The best contraceptive measures that can be taken during breastfeeding are condoms or placing an intrauterine device (IUD), subcutaneous implants, etc. Contraceptive pills are not suitable. It is recommended to pay attention to rest during breastfeeding, balanced diet to ensure adequate milk production.