There's no question that Luke is developing more slowly when it comes to speech compared to his twin sister. He is not yet speaking in complete sentences, but he can repeat almost everything. Here is a typical conversation with him . . .
My husband: Luke, do you have poopies?
Luke: Have poopies. (Nodding)
My husband: Lets get you all cleaned up.
Luke: All cleaned up. (Smiling)
My husband: There, doesn't that feel much better?
Luke: Feels much better. (Nodding)