My son's first 3-words English phrase

Yesterday morning, before ccw brought Aden downstair, he turned to me and said: 妈咪，等下你睡醒你下来ha。 Mummy, you come down when you wake up later.

I replied him: "Ok."

Then he said: "See you later."

I am surprised by him even though we have been using this phrase since he is small, but never really make him to pick it up. This is the first 3-words English phrase that he used.