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/libbillama]

Hypermobility can potentially be a culprit. Unfortunately, there's not really any great tests for this if you don't have a type of Ehler-Danlos Syndrome that's easily diagnosable within the context of medical billing codes.