It could be that the cartoons have themes that aren't suitable for your kids' age or they might promote negative behavior. Another reason could be that they don't meet certain educational or moral standards set by parents or society.
You can try searching on free stock image websites like Pixabay or Unsplash. They often have a wide range of clipart options, including those related to doctors and nurses.
First, familiarize yourself with the sheet music of Away in the Manger. Then, break it down into small sections and practice each one separately. It might also help to listen to some recordings to get the rhythm right.
Kemono comics usually have unique art styles and often feature anthropomorphic animals as characters. They can cover a wide range of themes and genres.