Hi ☀️ Who did an ultrasound at 37 weeks?

Hi ☀️ Who did an ultrasound at 37 weeks? How much do your babies weigh? And how much did they weigh when born? I had a 3rd screening at 33/34 weeks and our weight was 2500g, they said we would have a big baby, now on the 37th week - 2900g, in a month it's only 400g gained... in a couple of weeks already cesarean, I'm worried now that he's small ?? although I know that the weight on the ultrasound is not exact