I don't have children so no first hand experience but from the description it sounds like there are a few distinct areas in the Uwanja Camp, and that the one for kids 3 and younger may be a great fit for your little one.
Samawati Springs Pool
Make a splash at the Samawati Springs Pool—located just a short walk away at Disney’s Animal Kingdom Villas – Kidani! Featuring an exciting 128-foot waterslide and zero-depth-entry, this 4,700-square-foot, 118,138-gallon pool is the perfect place to cool off and have fun.
Nearby, a lounge and bar offer refreshments and snacks.
Uwanja Camp
The pool area also includes Uwanja Camp, a water playground with 3 distinct zones to please kids of all ages. At Observation Station, children 4 years of age and younger can climb through cargo crates, unscramble animal images and frolic through a gently bubbling geyser and shallow cistern pool—while their parents watch from nearby.
At Departure Zone, a leaky water tower and sneaky African irises squirt children 5 to 7 years of age, while at Base Camp, kids 8 years of age and up can douse each other with water cannons.