depends on what you want to spend but for us for our third family gave us money towards professional family photos which was wonderful (My Mum organised it )

A good carrier is great when you have more than one

A voucher towards/or a a new nappy bag, by number three my original one was a heap

A batch of pre cooked dinners? A voucher for help doing some cleaning or watching bubs while the sleep

Babysitting before bubs comes so they can have a last night out

A nice toiletries pack to take to hospital

Bibs are good, most of the second hand ones we had were grotty by number three