Gave some stuff away
Listed some stuff on local selling sites
Did a couple of car boot/jumble sales
Sold some on vinted
Gave some to charity shop
Chucked some in the bin if it was wrecked and couldn't be used again
It is a lot of work to list and sell stuff. If you're time rich and cash poor, it's probably worth it. If you're time poor and not struggling for money then it's generally not.
Clothing will get the most money sold individually on vinted with the option set up for people to build bundles. Try to list same size/season at the same time but stagger uploading the listings over a couple of days, because they only show up on people's feed as you upload them.
OTOH it doesn't always sell that way so you end up with leftovers. If you want to get rid of as much as possible and get a bit of money for it then bundles on a local site are best.
For individual baby items it just depends what it is. Slings sell well, bouncers don't (too bulky/a million of them already listed), towels I don't think I would ever have thought to buy second hand. Toys and books unless they are a recognised brand like Lamaze nobody will pay very much for although they can go well as a bundle if priced low. You could bundle the towels with the toys/books.
Personally I would not bundle all those things together because as a buyer I would be unlikely to want it all at once.
To avoid being scammed, only accept cash if someone is collecting in person (do not accept payment through site/paypal/transfer etc) and if you're posting, always use a tracked option if you're accepting payment through the site.
I used local sites mainly because the site I used involved a wider network of friends-of-friends (you had to be invited onto the group) so I didn't have to worry about scammers.