My scans estimated bubs weight and size at each scan but not in advance. Scans can be out by 2lb as well, so I wouldnt go panicking just yet. A 9lb bubba also doesnt mean you are gonna be torn to no end, much smaller babies can do that and much larger ones may not. My DD was no where near 9lb and I had everytjing but a 4th degree tear. A huge variation of things cause tearing. Dont worry too much about it, hun