You & your husband could have chromosonal checks done to see if anything shows up to indicate a greater chance of inherited problems.
But remember, this is a whole (& fast changing) new world so many mental health issues that people would have been locked up for or put on inappropriate meds/misdiagnosed etc even 10 years ago are no longer such huge unmanageable problems.
Personally we chose not to worry about these issues & have children - also though I would look into alternative treatments first before putting any child on medications which could set him/her up for life on ever increasing dosages or have negative side effects re development or create problems with giving other meds when the child is ill etc etc etc
11 years ago two of my friends were talking about their respective sons ages 5 & 6 who had been diagnosed with add & adhd respectively. My daughter was the 4 1/2 & really was a good child but so much of what these other two said I could have said too, won't tidy room, just tosses bag down, doesn't want to do homework, just refuses to do as told (here I would have said just doesn't hear when doing/thinking something else) & it made me wonder whether these 2 boys w really were add/adhd or whether it was (& still is) the "in thing" to diagnose a child with who is not a totally well behaved little robot??
So be careful about assuming that a child has "x" condition as opposed to then just being a child. My son (

is a totally wild thing & drives me to distraction but he's not add or adhd just very active & bright & inquisitive.