Mama is a 4th Grader is a Japanese anime created by Sunrise in 1992.
Natsumi Mizuki's (Satomi Koorogi) daughter is transported back in time
from 2007 to 1992. Natsumi must now try raise the child with her aunt,
Izumi (Kazue Ikura), while attending the fourth grade. An amulet around
the baby's neck allows Izumi to tell when the baby needs care. She
struggles with taking care of a child while attending school, keeping
her aunt from giving away the baby, and trying to get the baby back to
the correct time.