Order of acquisition in typically-developing children is based on how frequently they hear the different question forms:
That means, each child will have a different order that will work best for them based on which question forms they have heard most often.
- Yes/No is typically a high-frequency question type so that is a good place to start. There are also only two answers so that also makes it a good choice for the first to approach.
- What, Who, and Where are often the next to develop as they have more concrete answers than the other question forms. I would suggest trying a bit of each and go with whichever one the child has the most success with
- Why develops after the child begins to understand cause and effect. Make sure that is in place before attempting
- When develops after the child understands basic time concepts
- How develops in relation to each type of how question (procedural how questions once they understand steps in a sequence, describing how questions once they understand descriptors)