There are other syndromes related to Angel man syndrome with some of the same symptoms--can you tell me what they are? My grandson has lack of speech and infatuated with water play, small head etc... He was 2 yrs 4-30-13. No speech at all but can screech,sometimes babble, but makes no sense, does not say ma-ma or da-da. Has not had genes tested yet. Is going to a speech pathologist, but has not been tested to see for sure what is causing this. No problem walking as I can tell, but was a little delayed with it, no seisures yet Thank You