For those of you that have adopted or fostered drug exposed babies or children, how has the drug use affected the child long or short term?

SB has muscle tremors and spasms for a long while after he came to me at two months, a horrendous cry, a low stimulation threshold, and didn’t make eye contact. He was also on the very late end of meeting most gross motor milestones. However, he seems perfectly on track, even ahead, on many developmental milestones now. Of course, we don’t know how it might affect him long term, but for now he looks great. 

So, wondering what your experiences were?