The correct view is that pregnant and breastfeeding women have to make up the missed fasts, and what was narrated from Ibn `Abbas and Ibn `Umar that pregnant and breastfeeding women have to feed the poor instead, is a weak view that goes against the Shar`i evidence.

If a woman in nifas sees that she has become pure before 40 days are over, then she should do ghusl and pray and fast, and her husband may have intercourse with her.