+2 for the sling. My son is 2 now and I'm from Spain, I've never taken the pram
We took a Doona for our little one but you can also hire prams too for as long as you need for a fraction of the price x
You can also buy a pram insert for newborns that support their full body and neck.
Do you have any local WhatsApp parent groups? Worth asking around if anyone can loan you a buggy if you just need it for one holiday - and just get them a couple of bottles of wine or a just eat voucher to say thanks x
Bring a sling and put the infant carrier on the travel system so you have a car seat for airport transfers/any taxi's
I'd just put them in a sling when they're that tiny tbh