I agree with the other advice. I would also try to help him learn how to settle the baby. Show him positions the bub likes to be held in, how to rock him etc. Also explain that the bub picks up on stress so it's important to be calm and relaxed when holding him.

I am sure that as the bub gets older and interacts with bf it will be easier for him. Dads can find it hard when bub is little and they feel out of control. When bub starts smiling at them it usually gets a lot easier. Good luck.