UPDATE JULY 2018: Oliver is 4 years now and still doesn't talk in sentences (just a few single words), doesn't understand questions (especially if you ask him a question with a yes or no answer), and still prefers adults then his mates, prefers playing on his own, doesn't have any sense of danger (he's able to just walk in front of the cars on the road). He's got meltdowns when he's frustrated or when someone is trying to join his own games or activities. He's still not able to do any drawing (like a simple drawing of a face for example). Doesn't know how to use cutlery (only uses a spoon) or how to dress/undress (not even how to take off/on shoes or socks). Still in nappies (only for a poo now, hooray). He's very, very strict with his routines, so we have to follow all steps (if one step is not followed and the routine is broken then he goes into a huge meltdown and we have to go back and do everything from the beginning once again to calm him down). He's starting reception this September and he's going to have additional support in school. But apart from that, he's a very happy, super cuddly boy who loves laughter and have fun.
Early Signs of Autism Video - Oliver 2 1/2-Year-Old Boy - Autistic Behavior
Letters and numbers obsession.