Son is 4 years old, speaks with a large vocabulary without a stutter that isn’t age-appropriate (in my opinion) but lately started hanging on and having a hard time with the word “Can” and that’s the only word.

Son is 4 years old, speaks with a large vocabulary without a stutter that isn’t age-appropriate (in my opinion) but lately started hanging on and having a hard time with the word “Can” and that’s the only word. Update: he stopped. Admitted he was “kinda pretending.” Now he walks around pretending to be older “unlike that time I couldn’t say ‘can’” why didn’t these creatures come with a manual