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Have you done any kind of GD screening yet? If your blood sugar is wonky, it can make for a bigger baby. Normally that doesn't kick in until later, but if you have any underlying prediabetic stuff going on it could have already. They had me do a screening around 16 weeks or so since I had had GD before, but it was fine. Screened positive for it at 28 weeks.

@wrkbrk: I do second that the scans can be really far off. We were told our's was 4lb something, and exactly 48th percentile just a week ago. She came out 5lb7, which is somewhere in the 90's. So wrong in the wrong direction for you, but still a good example of the margin of error on these things.

I would totally not sweat it and definitely not adjust your diet unless you know you need to! (i.e., GD) My baby was measuring 80th percentile around 20 weeks and 89th percentile at 27 weeks! I was convinced I had GD. Well, I passed my test with flying colors. My doctor said babies are just different sizes! And, I just had a growth ultrasound at 30 weeks and now he's in the 55th percentile. So, it can change. (And, I have eaten a lot of carbs and gained a lot of weight!)

I don't remember the exact percentage but DS1 measured large at my 20 week anatomy scan. I remember googling the weight. He did turn out to be quite large and I was not diagnosed with GD (though I did have it in my second pregnancy). However my husband was also a 10 pound baby so I'm sure it was partially genetics and I wonder if I developed GD later on.

I have almost the same story as @macintosh: except I DID have GD. 8lb 13oz baby at 39 weeks and he always measured 2-3 weeks ahead on ultrasounds. I have family history of diabetes as well and I was worried I'd have it again for LO2, but nope!

I don't think you should worry just yet! The ultrasounds were correct with my first (and we'll see in August for my second, but he's measuring a lot smaller so far), but I know a LOT of people who had babies that were way off of what the ultrasounds said. And a lot can change in the next 20+ weeks!

It was later in my pregnancy, but at 32 weeks DS measures about 85% and the US tech essentially said my baby was huge. I was really upset and asked my OB if I was eating too much or doing something else wrong. He told me not to worry and that 85% just meant bigger than average but well within normal range. Ultimately I'm pretty sure the measurements we're a little off, DS was 6lbs 14oz at 37 weeks.

I didn't have GD - but I was a 9 pound baby, so I think we just have big babies.

@wrkbrk: nope, he was around 17% at birth. He was a little early, but I still don't think he would have been gigantic if he'd cooked a little longer. He's in the 80ish% now at a year