If you’re really stuck ask mum to be or whoever is organising the shower for her if there is anything she needs?
The friends that organised mine for me co ordinated between themselves and a few of the other guest so one got me bottles and feeding stuff, another got me a changing bag and filled it, another got me a baby bath with toys, towels and toiletries and so on
I also got quite a few gifts that were a mix of little useful bits and bits for me to treat myself which were brilliant and I think that’s going to be my go to gift in future
I got Loads of blankets, comforters and outfits (mostly in bigger sizes) which are lovely but I’ve now got more blankets and size 0-3 outfits than I think I’ll ever be able to use 
