My friend breeds Bulldogs and belive me it's not an easy breed as far as whelping is concerned.
Her bitch is from self - whelping lines , but she had so many(12) she was simply incabable of doing it her self.
As the vet said , her abdomen was so stretched with the litter it had no room to contract back in, so she ended up with a c-section anyway.
2 pups faded sadly but the remaining 10 are very healthy, and in great homes.

I urge your friend to think long and hard before entering into breeding BD's