Five Little Monkeys

The video is a playful rhyme about five little monkeys jumping on a bed. Each verse describes a monkey falling off and bumping its head, prompting a call to the doctor who advises against jumping on the bed. The number of monkeys decreases by one in each verse until none are left jumping.

What is the repeated phrase that the doctor said?

What changes in the number of monkeys jumping on the bed throughout the text?