Breastfeeding Birth Control
vs
Cervical Cap

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.
Cervical Cap

Cervical Cap

A small silicone cap that fits over the cervix by suction, used with spermicide before sex.
Efficacy98% typical use

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

Least effective see details

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

Cost$0–$300

Insurance: Varies

$90–$120

Insurance: Usually

DurationUp to 6 months postpartumReusable for 2 years (replace every 2 years or sooner if damaged)
ReversibilityReversibleReversible
STI ProtectionNoNo
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 small silicone cap fits snugly over the cervix and stays in place by suction, blocking sperm from entering the uterus. Used with spermicide inside the cap.

PrescriptionOTC No prescription / OTCRequired Prescription required
Available ProductsNo branded products yet1 product
Side effectsNone reported
  • Vaginal irritation from spermicide
  • Discomfort if not fitted correctly
  • Unusual vaginal discharge if left in too long
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
  • Cervical anomaly preventing fit
  • Active pelvic infection
  • Sensitivity to silicone or spermicide
  • Inability to insert or remove reliably