oh certainly they overlap saker. My 2 year old has his routines and likes things done in a certain order. The difference are his routines aren't a problem in the way his brothers are. For example ds1 had diarrhoea today and was desperately trying to get to the toilet but he still had to tap each carpet twice before changing rooms (this is a new one) and it tok him about 3 goes to get down the stairs (kept on having to go and start again). Likewise ds2 lined stuff up, but he had other play as well whilst he was going through his phase of doing that. DS1 meanwhile would turn a ball over and over in his hand, and would watch the wheels on a car go round, but had no other play. DS2 copies a lot of what we say- but he is 2 and echolalia is normal between 2 and 3- however it's not really echolalaia as he can also do things like change you to I appropriately. He only ever copies word for word if its appropriate otherwise he'll change the relevant pronoun etc. He would never do what ds1 did age 4 and say "ill get the keys" if he wanted me to open the car boot for example.
I just think its a dangerous thing for a paed to say as I think it gives the wrong impression, and doesn't actually tell a parent whether their child's behaviour is something you see in a checklist but perfectly normal (right age for it, isn't getting in the way of other things, hasn't lasted too long) or whether it actually is a symptom of autism. I've been flicking through Lorna Wing's book today and she makes the point that autistic behaviours are seen in NT children as well- but she also clearly makes the point that there is a big difference in the intensity and the length of time they last.
When we talked about the ferry last week with some family members we said "ds1 had to walk round and round the whole time he would not stay in the cabin" and they said "oh that's his age all 5 year olds are like that" - well I watched other 5 year olds on the boat and sure they were lively- but they circulated in small areas from the same spot, they wanted to sit down and eat, they wanted to play with machines, in the soft play area, watch videos, watch the children's entertainer etc and they could sit down and talk, play with their toys, colour, look out the window. DS1 only wanted to walk blankly around the boat (in a set pattern after the first time- here first, look out of this window for 5 seconds, move in that direction for so long etc, double back and touch that chair etc). Superficially the behaviour sounds similar ("oh no 5 year old boys can keep still") but in reality the behaviour is completely and utterly different.
I get sensitive to professionals saying things like this as I think they should know better. Most parents with a young autistic child have their fears brushed off in this way by well meanining relatives for a long period of time (often even after diagnosis- we still get it) and if parents are genuinely worried then that sort of comment placates for about 2 hours then you are left scratching your head again. In Juniper's case it sounds as if no assessment was possible- it would have been more helpful for the pead to have explained the sorts of things to look out for etc and to have explained the difference - what the checklists actually mean if you like- and for Juniper then to be able to decide whether or not her son's behaviour did fit the pattern or not. Otherwise you can be left almost feeling as if it's your fault if these things don't go away.