Breastfeeding Birth ControlvsInternal Condom

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

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.
Internal Condom

Internal Condom

A soft pouch worn inside the vagina that blocks sperm and protects against STIs, available by prescription.
Efficacy98% typical use

Moderately effective: over 90 out of 100 people successfully prevent pregnancy per year.

79% typical use

Least effective: under 90 out of 100 people successfully prevent pregnancy per year.

Cost$0–$300

Insurance: Varies

$0–$4 /per unit

Insurance: Usually

DurationUp to 6 months postpartumSingle use
ReversibilityReversibleReversible
STI ProtectionNoYes
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 soft, loose-fitting nitrile pouch lines the vagina and collects semen. The inner ring anchors it at the cervix and the outer ring stays outside the vaginal opening.

PrescriptionOTC No prescription / OTCRequired Prescription required
Side effectsNone reported
  • Mild irritation or discomfort
  • Noise during use if not positioned correctly
  • Slippage with incorrect insertion
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
  • Sensitivity to nitrile (rare)

Key differences

Breastfeeding Birth Control is more effective (98% vs 79% typical use). Breastfeeding Birth Control duration: Up to 6 months postpartum. Internal Condom duration: Single use. Only Internal Condom protects against STIs. Internal Condom requires a prescription; Breastfeeding Birth Control does not. Breastfeeding Birth Control: costs $0–$300. Internal Condom: costs $0–$4 per unit.