How absolutely heartbreaking. We had the same thing occur with our first baby. She would be 8 years old.
Personally, as someone who did not want anyone touching my baby's things, I would wait to see if they ask for help with this. It is very very personal and even if I had wanted that kind of help I would probably be very selective as to who I wanted. Most grieving parents I talked to at the time wanted to deal with the baby things themselves.
Help with food, chores, errands etc... is always good. I think one of the most touching things that someone did for me at the time was when my uncle (they were keeping him for a few days) gave my dog a bath.
I did use a couple of online support groups, sometimes just for reading and not participating. MISS Foundation is a really good one. Most of the bigger pregnancy/parenting message boards have loss groups, but those can be harder to visit for some people.