Hello Baby is a reality TV show by a famous South Korea girl group, Girls Generation (SNSD). The girls had experienced what motherhood is like by taking care of a baby boy for months.
They selected The Best Mom and The Worst Mom among the members according to their work for the day. Usually, for The Best Mom, she would get a prize and sticker on a chart that shows who was The Best Mom and the number of times with a picture of the member. Meanwhile, The Worst Mom would probably get a punishment such as cleaning up. Sometimes the dads would choose the Best and Worst or by the members (SNSD) voting in the episode.