Laugh.. a milestone?

Just this evening when we got home after dinner, YT fed him. After his feed, he placed Shawn on the bed. We played with him for awhile and talked proper English to him. He laughed! We were surprised but delighted. It took awhile before we managed to make him lauged again! Another thing that he did today was he responded to the same question in the same manner. He was making funny noises. So I asked him "Who is making funny noises?". He then responded in the same manner over and over again making same funny noises. He's one cheeky little boy!