Im not a child pdychologist, but i have a teaching degree and i was abused. My advice is this. Keep routine as normal as you can. Make sure to tell him he is a , "good boy." And you love him. Serouisly , you cant tell these things too much. Be sure to tell those taking care of him that they can tell him these things as well. Also, still keep good boundaries for him. Ie rules. These will make him
feel safe. So dont spoil him silly ie let him walk all over you. I mean dont become strictest parent on the block either.

Also, whenever the subject comes up WHEN HE FEELS LIKE HE HAS DONE SOMETHING WRONG AND HE HASNT, DISCUSS IT!! EXPLAIN HE IS A GOOD BOY AND HAS DONE NOTHING WRONG. LOOK INTO HIS EYES. LET HIM KNOW HAW VERY, VERY IMPORTANT IT IS HE KNOWS THIS. :-) you are a good mom. Thank you for being a good mom. :-)