Anxious father

Im now 10 weeks pregnant and my husband has acted very distant since we knew of the pregnancy. We had a long talk and he confided that he is feeling alot of stress and anxiety, mostly from fear of the child having disabilities as his family has a history of disabilities. We have decided before trying for a child that if we do find out that the child has any disabilities we will choose to let it go, but he is scared of undiscovered conditions that we wont know until the child's birth, which he said he cant handle it. I understand that such fears are common for any parent, but he s losing sleep over this. What can I do to help him get over his fear and anxiety? We are first time parents