I'm at the opposite end of the scale ttc - I'm on extra monitoring now as she is on the big side of things. Scan last week (28w1d) had her at 1.33kg and above average head and tummy. Average sized legs (they'd previously been measuring 2 weeks ahead so she's grown into them).
Makes sense that it comes down to blood issues. I'm still on steroids and they are thinking her growth is a combination of that and diabetes - even though all of the tests show me as being negative for diabetes.