Tenchi Muyo

When Tenchi's Aunt suddenly becomes sick, it falls to Tenchi and the girls to babysit till she gets better and it soon becomes apparent that none of them know to much about caring for babies, all except Washu. When the baby wanders into her lab one night, she finds that she has to care for him because all the girls are sleeping with exhaustion from their babysitting adventures during the day. As she cares for him, it brings back memories of her child that she had when she was much younger and starts getting really attached. When the baby goes home to his real mother, Washu tells of her first child and the circumstances of him being taken from her. Washu then transforms into a mature version of herself and mentions to Tenchi that she would have another baby, if it's with him, which sparks a war with and between Ayeka and Ryoko.