It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said about a woman in postnatal bleeding: "She should take a ritual bath, then enter ihram and perform all the rites except the circumambulation (tawaf) of the House."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11978