Scans aren't always accurate as well.... 2 days before Jovie was born the u/s showed her at 10lb11oz and the sonographer was concerned that I had GD (I was almost 42 weeks). The OB's told me I had to be induced because of the large baby. Jovie came out 8lb 13oz. So no where near the same size. She was tall & had a large head which made them think she was bigger because scans only measure the length of the bones and not body fat. Its is totally impossible for a scan to measure body fat.