Types

Oral contraception pills are comprised of female hormones: progestin and estrogen. It's best to choose a progestin-only birth control pill during breastfeeding, as estrogen has been shown to reduce milk supply.

Doses

Progestin-only birth control pills come in many strengths. Higher doses have been shown to affect the protein and nitrogen levels of breast milk. Low-dose versions of the pills, called the mini-pill, is often prescribed for breastfeeding women, as the amounts of progestin in them do not inhibit milk production.

Effectiveness

At around 90 to 95 percent effectiveness, mini-pills are slightly less reliable than combined estrogen-progestin birth control pills. To be most effective, the mini-pill must be taken each day at the same time, within a three-hour window.

Side Effects

Side effects of the mini-pill are fewer than those of combined estrogen-progestin pills. Occasional spotting between periods is reported by some women, as well as irregular periods and breast tenderness.

Other Safe Contraception

During breastfeeding, barrier methods such as the cervical cap, condoms, or diaphragms may be used. Some brands of the intrauterine device also make for good options for breastfeeding mothers.

Source:

Breastfeeding Information

Types of Contraception

Mini Pill Information