My DH is 6'4" and I am 5'7" and our first was 6lb14oz, and the second was 7lb10oz. No trouble with labour at all. My Ob said that generally, babies fit their mother's bodies, and their father's influence shows later. Don't know if that's true for everyone, but my babies were fine for my body. Hope all goes well for you, and that you have a great, easy, natural labour soon!