Fiona the hippo back with her mom

CINCINNATI (FOX 13) - Fiona, the premature hippopotamus born at the Cincinnati Zoo, is back together with her mother.

The zoo released video of the pair playing underwater. According to the zoo, hippos use their mouths to play, show affection, give warnings, and explore their world.

Fiona was born 6 weeks early and weighed only 20 pounds. She has been under close supervision ever since.

While the 2 are spending more time in the outdoor pool, there is not set schedule for when she will be out.