My wife had cesarean delivery 12 months ago. She has uterine tumor of 2.2 x 1.6 cm in myometrium. After delivery she had been continuing periodical discharge for two months. Period has been stopped since last 10 months. My wife is still breastfeeding our baby (son). The doctor has advised to stop breastfeeding to start menstruating. If she did not get a period, then what problem can occur? Please explain me in detail.