how soon can you go back on birth control after a baby
Some forms of birth control require several weeks to be effective. This, combined with the fact that a woman may begin ovulating as early as 25 days after giving birth, indicates that a new mom should begin thinking about birth control methods as soon as possible after having the baby -- or ideally, during pregnancy.
21 days after birth. You can start to use a contraceptive implant from 21 days after the birth. If you are not breastfeeding, you can start to use the combined pill, vaginal ring and contraceptive patch from 21 days after the birth. However, if you are breastfeeding, these three contraceptive methods may affect your milk supply and you are usually advised to wait until the baby is six months old.
So even if you're not ready to have sex just yet, you will need to start using contraception from three weeks to four weeks after your baby's birth (Cole 2011). If you're breastfeeding exclusively, and haven't started giving your baby solid food or formula milk, you may not need to worry about contraception yet.
Around six weeks after birth. You can usually have a contraceptive injection or start using a diaphragm or cap around six weeks after giving birth. If you used a diaphragm or cap before becoming pregnant, see your GP or contraception (family planning) clinic after the birth to ensure that it still fits correctly.