Not IME. DD2 was nearly a pound smaller than her big sister, despite being an extra day overdue.
I've never really understood worrying too much about size TBH. As far as I can tell (within normal limits) position, size of head and size of shoulders make a lot more difference than overall weight. Certainly once your pelvis has done it once women seem to find it a lot easier second time around.
No - all of my subsequent ones where smaller than the sibling of the same sex:
DS1 - 8lb 15oz and only 37 weeks!, DS2 - 8lb 6oz at 39 weeks DD1 - 8lb 1oz, DD2 - 7lb 1oz (although had diabetes with this one, so was eating way less sugary stuff than with any of the others!)
I was also getting quite worried with DS2, as DS1 had been early and still pretty big. I could tell the moment he was born that he was smaller than DS1! All the births were fine, apart from the first (DD1), but she was induced anyway!