Yeah it is the thigh area for us too!
Just frustrating when we get through so many disposables and our bin men have been on strike for weeks and still are for a while 😑
Had this problem too! I’ve been thinking of getting some newborn specific ones or hiring from our local cloth nappy group.
We have a similar issue with our baby, her thighs don't seem big enough to fill the nappies out to prevent leaks