Re: WWYD when DH "Drops" the baby...
I would first of all make sure my dc was okay, then I would hug and comfort DH. After that, I would laugh it off, drop it, and never mention it again. I'm sure he's giving himself quite the guilt trip already, and by being openly angry with him, you are just making it worse, and possible reducing your DH's confidence in his ability to care for your son and therefore guarenteeing less help and participation on his part for a while.
I know it must have been scary and made you just sick to see, but try not to let your dh know that... poor guy will probably be beating himself up for days as it is. I know mine would.
Mama to Henry (01.07), Catherine (09.11), Audrey (04.14), Clare (09.15) and our newest addition, coming July 2017!