The risk of developing ADHD was 3 times higher among children whose mothers used the pain-relief drug acetaminophen (paracetamol) during pregnancy. The association was stronger among daughters, with the daughters of acetaminophen-exposed mothers showing a 6.16 times higher likelihood of ADHD.

[u/mvea]

https://newsroom.uw.edu/news-releases/child-adhd-risk-linked-to-mothers-use-of-acetaminophen

[u/hellomondays]

However we know that gene expression plays a large role in the development of ADHD. Older parents are more common nowadays, which leads to  higher level of genetic mutations in their gametes, so you would expect a more diverse genetic profile influencing a fetus, then a child's development. 

[u/randylush → u/hellomondays]

But more likely to make super mutant babies