This is what I have observed too.
The only people I know who refused out grown / no longer used things for their baby (from close relations or friends, not even charity shops or bought at sales or on-line) were the couple where she became pregnant early in their relationship / had no home / she wasn't working - people who actually had the least in life.
@TheLionTheWitchAndTheChesterDraws . You have no idea about other people's backgrounds either. Many of us grew up in the same way that you did. Many of us learned from that, that there is nothing wrong in wearing something pre-worn, or using furniture that someone has given you, and that is a very sensible way (or, in my case at least, the only way to manage on a tight budget. Then, as life has become more comfortable over the decades, you realise it just makes more sense to pay a fraction of the cost for the same thing.
I'm ok with second hand but it's such an effort to find decent things. I've posted about this in a bit of rage before ... but charity shops seem to have this new thing of arranging clothing by colour on rails all crammed in very closely together, rather than by size or type of garment.
This ^ give me the rage too. Fortunately where I live, there are plenty of charity shops so I am able to use those that display clothes sensibly.
To be fair, in the giant M&S near here, it is overwhelmingly difficult to think "I need a pair of work trousers so I can go to this rail" - they have multiple different 'areas' the trousers might be in and it is a nightmare trying to look through them all.