Baby showers are usually just a casual thing, I'd be a little put off by a gift registry, but that's just me. I would get them another present when bubs is born & you know the sex etc....so usually a baby shower is just small things. I'd be inclined to be happy with anything, it usually all gets used anyway and anyone who knows you already have a child would think of that first.....also often you get creams, nappies etc it all comes in handy. Or as I mentione previously you could have the "bubs has got enough, something for Mum would be great".