If they are very well off, I might not go with any of the 'normal' things but something more chic like designer baby wear, baby jewelery, luxury organic baby toiletries, monitor Stella posted, or personalised items like embroidered baby bedding and burp cloths - issue being the name, maybe "Joe and Sarah's Angel" or some crap could be used etc. Basically I might think the adage of buying things to 'help' would not really apply if they are set like that, and swing more frivolous.