Breastfeeding Birth ControlvsDiaphragm

A side-by-side comparison of two birth control methods — efficacy, cost, how they work, and who shouldn't use them.

Side-by-side comparison

Method	Breastfeeding Birth Control A natural postpartum method (lactational amenorrhea method, LAM) that relies on exclusive breastfeeding to suppress ovulation, effective for up to 6 months.	Diaphragm A reusable silicone dome that covers the cervix to block sperm, used with spermicide each time you have sex.
Efficacy	98% typical use Moderately effective: over 90 out of 100 people successfully prevent pregnancy per year.	83% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year.
Cost	$0–$300 Insurance: Varies	$60–$112 Insurance: Usually
Duration	Up to 6 months postpartum	Reusable for 1-2 years (replace every 1-2 years or sooner if damaged)
Reversibility	Reversible	Reversible
STI Protection	No	No
How it works	Exclusive breastfeeding suppresses the hormones that trigger ovulation. High prolactin from frequent nursing keeps estrogen and progesterone low, preventing the return of menstrual cycles.	A reusable silicone dome covers the cervix to block sperm from entering the uterus. Used with spermicide for added effectiveness.
Prescription	OTC No prescription / OTC	Required Prescription required
Side effects	None reported	Increased risk of urinary tract infection Vaginal irritation from spermicide Discomfort if not fitted correctly
Who shouldn't use this	Baby over 6 months old Periods have returned Not exclusively or nearly exclusively breastfeeding Use of supplemental formula or solid foods	Uterine or cervical anomaly preventing fit Sensitivity to silicone or spermicide Inability to insert or remove reliably

Key differences

Breastfeeding Birth Control is more effective (98% vs 83% typical use). Breastfeeding Birth Control duration: Up to 6 months postpartum. Diaphragm duration: Reusable for 1-2 years (replace every 1-2 years or sooner if damaged). Diaphragm requires a prescription; Breastfeeding Birth Control does not. Breastfeeding Birth Control: costs $0–$300. Diaphragm: costs $60–$112.