Quoting TheCoopersKnitWitch:" Well hopefully you don't end up like me! My babies always measure 4-5 weeks ahead in the last month! ... [snip!] ... 4 oz at 40 weeks and some days 8lbs 11oz at 37 and 10lbs 2 oz at 39 weeks. but in all reality, you'll probably have a 9lber!"
well shes measured a month a head every appointment, i went to the hospital to get the u.s befor 12 weeks she measured 9, then went a month later and she measured 15 weeks ( should have been 11 1/2).. and has measured big every since