#1 DD was 9lb 5oz. I had to be induced at 41 weeks due to pre eclampsia but was told throughout pregnancy i will probably have a big baby. Her shoulder did get stuck, but i reckon this was due to having to have vacuum extraction.

#2 DS was 9lb 0.5oz. I went into spontanious labour at 39w3d. Labour was long but only because he was posterior. But he came out without any trouble at all. Actually he came out so fast all the blood rushed to his head. So pretty much the same size as DD but had no trouble. (which is why i think it was the vacuum that got her stuck)

I was told it doesn't matter the size of the baby, just the head. A 7lb'er could have a 35cm head and so can a 10lb'er. Once the head is out the body usually just slides out after.