So far my 38 weeker weights 7lbs 5oz according to the US but we will see nxt week when i have him they told me he go be 8lbs the most which they said that bout my 1st son he was go be nomore than 7lbs and he turned out to be 9lbs 7.3oz...
With my first they said 9lbs and she was 5pound 5.
My second they said 9pound if I got to 40 weeks and she was 8pound 6 at 38.3 so it was spot on for her.
They can be off but some can be pretty accurate. I think given you're previous bubs size it sounds like they may be right?