The record for the most kids born to a single mother is 69. Russian Valentina Vassilyeva labored 27 times and gave birth to 16 pairs of twins, 7 sets of triplets, and 4 sets of quadruplets. – WTF Fun Facts
Source: https://www.guinnessworldrecords.com/world-records/most-prolific-mother-ever?fb_comment_id=84106