First word

A does lots of imitative speech. For example if he is looking at something and we name it he will try to copy the sound. Last week at the museum he said something recognisable not in imitation (at least the first time I've noticed). Reaching out for the door of the cubicle we were in he said "ah-dooooooooor". I know I'm not crazy because M excitedly turned around and said "Did he say door?"