Hard to say because for every useful suggestion, there's a chance somebody else has already bought it. Some things I'd have found useful - a nappy changing setup, with plenty of nappies and wipes and cream and maybe a changing mat. Sleeping bags. Boring clothes (vests, onesies). Professional cleaner. Takeaway voucher. If you can check what they already have that would help. Or if all else fails, get nappies and wipes.

The one certain piece of advice I can give is DON'T BUY TOYS.

So many toys...