Are you gestational diabetic? That is the only reason I know of to worry for too large baby. They just might want to do c/section if he's too big. Dont know sorry

Thay are probably chjecking for extra fluid around the baby- just because there's been such a quick increase in measurement- they might not find anything though- in the last 4 weeks of pregnancy, the baby gains some ridiculous amount of weight, like a pound a day or something crazy. That's probably what's happening- it may be that you will have a biggish baby- especially if you or the father are quite tall.

They will do ultrasounds at the drop of a het at the end of the pregnancy, usually because, buy that stage, if anything strange is going on, it's late enough to induce labour or whatever, with little ill effect to the baby.

I measured a little big in the later part of my first pregnancy- i'm 29 weeks into my second, and have started measuring big again. I'm 5 foot 8, my husband is 6'3. Our first daughter ended up beingborn (spotaniously) at 36.5 weeks- she weighed 6.8 pounds. She was well on her way to being a whopper- but I had no problems, and no stitches or anything, so don't freak out.

Do be prepared to go early though- it won't hurt to have your hospital bag packed and baby seat installed in the car anytime around nowish !!!

Good luck !!

I always measured big during my preg. At 36 weeks I was also measuring 40. I had my son 4 days before my due date and he was 8lbs,6oz .A.N.D. They fionally found out I had 2 amniotic sacs (???) so there was extra fluid and my son was kind of big.

My mother had gestational diabetes and that made all her babies smaller. I on the other had was the only (first child) one that she didn't have it with and came out 8 lbs 6 oz 2 and a half weeks early. Some women measure larger than others, I wouldn't worry about it. My mom's second child was only a little over 7 lbs but she was a pretty big woman for awhile haha. I wouldn't worry about it, if the ultrasounds are coming back normal. Who knows, you might have a big whoppin baby, but the ultrasounds will probably find that nowadays so if it's too big to have naturally they can just go for a csection at the start. Good luck!