Take a look at Fetal Alcohol Syndrome (FASD). It is often misdiagnosed as ADHD because many symptoms overlap. Here are a couple articles on FASD in Adoptive Families Magazine:
https://www.adoptivefamilies.com/adoption-process/prenatal-alcohol-exposure-signs-and-treatments/
https://www.adoptivefamilies.com/parenting/different-parenting-handbook-children-fasd-fetal-alcohol-spectrum-disorder/
Penny
ADDitude Community Moderator, Parenting ADHD Coach & Author, Mom to teen w/ ADHD, LDs, and autism