Asslam alikum,

Can a muslim have janabath soon after delivery if in clean state

The majority of scholars, including the four imams, are of the view that there is no minimum limit for nifaas. Whenever a woman becomes pure from nifaas, she has to do ghusl and pray and fast, even if that is before forty days have passed since the birth. Because no precise definition has been narrated in sharee�ah with regard to the minimum length of nifaas, so the matter should be based on experience, which shows that nifaas may be very short or it may be long. - Ibn Qudaamah in al-Mughni, 1/428. Some of the scholars narrated that there was consensus on this point. Al-Tirmidhi (may Allaah have mercy on him) said: The scholars among the companions of the Prophet (peace and blessings of Allaah be upon him), the Taabi�een and those who came after them are agreed that a woman in nifaas should stop praying for forty days, unless she sees that she has become pure before that, in which case she should do ghusl and pray.