The investigators propose to compare the """"""""potential beneficial effects"""""""" of two contraceptive pills in the prevention of lactation-induced demineralization. A randomized study is proposed to compare Loestrin(an estrogen-containing agent) with Micronov(a progesterone agent). Contraceptives will be administered in the normal dose from 4 weeks to 6 months post-delivery. Bone mineralizaation will be assessed by DEXA at the onset of contraception therapy and at 6 months post-delivery.
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