K.S.
I didn't read all the other responses, but here are my thoughts. My twins were in the NICU for months and here are some things that helped me.
1. Calendar and a nice pen. It let me write down little positive milestones each day. It really helped me cope and try to stay on the positive. Hallmark has some blank baby calendars but you could get whatever.
2. Small basket of healthy snacks for the mom to leave up at the hospital - granola bars, peanut butter crackers.
3. Frozen dinners for home.
4. Gift card for lunch at a nearby fast food place to grab lunch while at hospital
5. Offering to run small errands.
6. Just a nice phone call to offer support and not asking when the baby will come home. Even if you don't get a call back it is so nice to know people are concerned.