Hazrat Harith Akli (may Allah have mercy on him) said that there is no harm in marriage during nifas (postnatal bleeding), but the husband should not have intercourse until she has performed ghusl (ritual purification bath).
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2702
Hadith Gradingمحدثین:إسناده صحيح مقطوع
Hadith Takhrij«إسناده صحيح مقطوع، «انفرد به المصنف من هذا الطريق»»