I have a daughter with ASD and we had 3 scans on her whilst pregnant, one was during a m/c scare, another was the 20 week one and the last was at 30 weeks whilst at work when the probe was on us for 2 minutes tops.

I don't know about the relativeness of ASD and u/s... or cord clamping for that... I DO know that there is a strong link in genetics towards ASD. It runs in families. Its not a death warrant. Its hard work, but its not the end of the world, its just the beginning of a new one