I am in a similar quandry exactly for the reasons Whelk describes. I have DS who is 12 next week. He was 8 weeks premature and slow to walk and talk, and at age one was definitely not very social. He had the MMR at 18 months, and we did not notice a change overnight. But he has since been diagnosed with ASD.
There is a definite history of AS in DH's family, and DH himself feels he is on the spectrum. He and DS also have hayfever and similar dust allergies.
So now we have DD who is 10.5 months, so coming up for the MMR soon. She is very social, not delayed in any way. What do we do?
For any of you who noticed a change overnight, did you have any pre-dispositions to autism - ie in the family, allergies etc?
I am genuinely at a loss at the moment - we may do the MMR and it be fine, but if DD then regressed, we would never forgive ourselves. When pregnant I agonised over the swine flu jab, had it in the end, and all ok. But this decision is much harder.