Corrected sentence (simple for a 4-year-old):
A little hat pops up after the rain. It stands on one leg.
Why this is better: The original sentence is mostly okay, but splitting into two short sentences makes it easier for a young child to understand.
Riddle (short and kid-friendly):
I wear a little hat after it rains.
I stand on one leg in the grass.
What am I?
Give the child time to guess, then say: Answer: a mushroom ðŸ„
Tip for reading: Read the riddle slowly and with a smile. You can show a picture of a mushroom to help your 4-year-old guess.