AIBU to think that measuring the BMI of babies in the womb, is a step too far? I mean, surely a child's birth weight (unless it's extremely high/low) isn't exactly an indicator of anything much...considering all babies feed differently?
My DS2 was only 5lb 7oz (the smallest by far of my 3 DS) and yet, he's the heaviest of all of them and gained about an ounce per day from birth.
Other babies, can be born heavy and lose an ounce a day....so what does the study really mean in terms of anything much? 
www.telegraph.co.uk/health/healthnews/8788593/Overweight-mothers-give-birth-to-fat-babies-study-finds.html