Any concerns with getting the runt of a litter?

My in-laws adopted a cat who was pregnant. I have fallen in love with the runt and I need her lol

Do they end up having more health problems than the others though? Not that it would stop me from getting her, I just want to know if there are any concerns I should be aware of and keeping an eye out for.

We'll need to take her in for her shots and everything once we get her, so of course I'll talk to the vet too.