This is an important topic.
There are those who view buying items before the birth as an ayin hara. For those who are unconcerned with ayin hara, there are emotional implications if c”v the baby is not healthy and certainly if it does not survive. There can also be social implications as someone else has noted,with families who are having difficulty having children. I think that the Rav’s advice mentioned above, to buy if necessary but not to flaunt it, is very sound advice.