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喂奶有暂时的避孕效果。但不是有效的避孕办法,因为哺乳妇女的排卵和行经的恢复有很大的个体差异。所以在哺乳期需要一种避孕方法,为此目的,多使用口服避孕药。不过关于外源的甾体避孕药在既定的哺乳期间进入人奶方面,最近才进行研究。外源的甾体避孕药进入人奶中的最初研究,是用标记的甾体来进行的。新近分娩和泌乳但未喂奶的妇女在4～6天内分泌到乳汁中的标记异炔诺酮(Norethynodrel)和双醋炔诺酮(Ethynodiol Diacetate)不到口服剂量的0.13%。以后用异炔诺酮进行的研究中,得到比前者略高的估计。每天进入600毫升奶汁中的标记的去氧炔诺酮(Lynestrenol)或甲地孕酮(Mestranol)及其代谢物约为母亲
Breastfeeding has a temporary contraceptive effect. However, it is not an effective contraceptive method because of the large individual differences between breastfeeding women’s ovulation and recovery. So in lactation need a method of contraception, for this purpose, more use of oral contraceptives. However, studies on exogenous steroid contraceptives have been recently introduced into human milk during established breastfeeding. The initial study of exogenous steroidal contraceptives in human milk was done with labeled steroids. Newly delivered and lactated but non-lactating women secrete less than 0.13% of the oral dose of norethynodrel and ethynodiol diacetate secreted into milk within 4 to 6 days. Later studies with norethindrone obtained slightly higher estimates than the former. The labeled Lynestrenol or Mestranol and its metabolites tagged in 600 ml of milk per day are approximately mothers