if one touches mother whogave birth need to take bath

 Angira Muni explains the untouchabilitly of those observing Sutak of birth.  ‘During a birth Sutak, one may touch other members of the family except the Sutaki (mother who gave birth).  If the Sutaki is touched, then one can purify themselves by bathing.’

https://www.swaminarayan.faith/scriptures/en/shikshapatri/general_dharmas_for_all_followers/88