Autism symptoms or just SPD?

Hi all, i'm a bit confused regarding the symptoms of autism - we've had some concerns about our son but it's unclear whether certain things are 'normal' in moderation or an indiciation of an ASDSo my son's 21 months, and in his first year we noticed that he didn't really make much eye contact with us, and wasn't very sociable with us at all - however he has changed. Below are some characteristicsFlaps arms when excited - not overly so thoughDoesn't speak - makes lots of shouty noises (loves screaming in a high pitched voice too!), and he has recently started saying 'Mum', 'Dad' and 'Yeah' but without any context. He also loves talking to himself in the mirror!Makes good eye contact with us now - always responds to his name and looks at you directlyLoves lights, fans, and spinning objects - he always has to be honest. However he'll get bored within a few minutes, am I right in thinking usually in autism it's a constant thing? This is our main concernSensory defensiveness - hates his hair/face being touched, certain textures of foods. Scared of certain noisesSensory underresponsiveness - Very very active, always has to be moving. Loves being thrown out and rough play, constantly taking risks. Even after falling and hurting himself, he won't learn not to do thatMore social than before but doesn't interact with other kids, other than to take toys off them.As he can't talk he grabs you by the hand and takes you to where he wants, it's difficult to know sometimes what he wants and he gets frustratedDoesn't seem to feel pain a lot of the time. He'll stand on stones/toys which would hurt other kids/people, but he seems to like the sensationWhat confuses the issue is that in my family, every single boy has had Sensory Processing Disorder and Dyspraxia, including myself. And I know there's a lot of crossover between SPD and autism, so it's difficult to know whether it's just SPD or something more. I didn't speak 'til I was 2 due to the SPD!So my real question is if (generally) in autism, the love for spinning/lights/fans is more of a constant thing instead of just an interest? How severe do the symptoms sound?Thanks! via /r/Parenting http://ift.tt/2umH5Tl