Copper - T is a kind of IUD, which releases Cu ions (copper ions) in uterus. This reduces sperm motility and stops m from reaching egg.

Lactational amenorrhea is inability of a female to menstruate after parturition. This is time when female lactates extensively to support growth and nourishment of baby. Lack of menstruation removes burden of blood loss and weakness and also acts as a measure to prevent anor pregnancy before baby is grown sufficiently to feed himself/herself.

• Lactational amenorrhea is temporary postnatal infertility that occurs when a woman is amenorrheic and fully breastfeeding. Cycles without ovulation are most common during first six months postpartum.
• Periodic abstinence is natural family planning by not having sexual intercourse on days of a woman's menstrual cycle when she could become pregnant.