Measure the fill depth of the baby pool by extending a measuring tape to the interior base from 2 inches below the rim.
Tie a string to the base of the floating pool fountain and extend it out to the measured fill depth plus one inch before cutting it off.
Glue the last inch of the string to the center of a dry baby pool using a waterproof adhesive. Allow the adhesive to fully dry according to the individual product instructions.
Place towels around the perimeter of the fountain prop to catch any over spray from the fountain. Load new batteries into the floating fountain.
Place the floating pool fountain in the center of the pool and pour in water until the string is almost fully extended. Turn the floating fountain on and adjust the height of the spray so the majority of the water falls into the baby pool.