I was going to say whatever it is, don't get something for the baby, or if you do, get them something too. Before ds1 was born (due in May) I got a load of baby stuff and was still at the stage of being superstitious and not getting him anything so was freaked by having all this stuff that needed storing, would have been hanging around too long to take back if there was something wrong with it and also by being seen as just a vessel for ds1. DH got plenty of presents of his own that were things that he liked - books, food, etc etc. The baby was for both of us and yet he didn't get any baby things and I didn't get anythings for me (sorry, I know that sounds a bit like I expect presents, I don't, but I didn't expect there to be such a clear division in the way that dh and I were treated).
However, as they've asked for stuff... How about some of the nice smellies that are suitable for pregnant women or for just after birth, also suitable for babies... some really nice handwash as you suddenly have to start to wash your hands a gazillion times a day and the normal stuff I used suddenly my hands became all manky as they couldn't cope with it (I had one of the Korres ones - loved it. Also had their leg gel for pregnant legs which was fab). and ditto baby-friendly hand cream.
I don't know if they are planning on breast feeding their dc - I know I was but wasn't able to in the event, which meant I had to run out and get bottles, sterilising stuff etc all in a panic. I later discovered the mothercare sterilising bottles which you could put into the microwave by themselves, without the need for a steriliser - they acted like their own little steriliser. They were fab - no faffing around with sterilisers, the bottles stayed sterile for ages after so long as you didn't open them and they also acted as mini sterilisers for ds's dummies when needed. Having just one bottle like this in by me would for a reasonable price have meant that in the early days if I needed to give ds1 a bottle of ebm or a carton of milk I could have done, without the expense or hassle of going down the whole bottle feeding route. When ds2 came along, he did take to breastfeeding and it was great, he had very few bottles. But the ability to give him the occasional bottle in the early days when I was too sore or in too much pain or so sleep deprived that it meant somebody else could - was fantastic. I did use different teats in them, not the mothercare ones, but that is something that depends on what the baby likes.
As I said - it was a fantastic back up plan to have in by me - although I suspect the shops probably hate it as it means they sell you a bottle (and then maybe a box of 6 later on if you do start to use them regularly) rather than the big expensive steriliser and starter sets that they must make much more money on!