This is my third and all of them have been told through my high risk dr starting at 28weeks (which is what I am now). My dr tracks their size because I have had complications and big babies. This one is measuring large also, approx 3.3lbs already and I just hit 28wks today.
Mine told me at 28 weeks, we had a 4D scan while in latvia, then when we were back in Ireland at 30 weeks they gave me almost the same weight so they xant be too far wrong!
Mine doesn't do it either.
My doctor doesnt do it either unless theres something wrong.
My doctor said she doesn't do it because they can be off by a lot u would have to ask your doctor n.see what she says