No i don't think they could have predicted it before birth. It is something that is already there but not sure how thy could check before birth. My health nurse said that most parents don't pick up on it so early either, so that was an advantage for him. Maybe having 5 others first helped in that respect. I believe that if he had of been my first i may not have thought anything of it. But thankfully i did notice something was out of the norm. He is a little trooper. He is a big boy too, he was almost 9kg at his 6mth check and he is still fully BF, so he not going on solids just yet as the more weight he carries the harder it will be for him. Mind you he still sleeps through the night and is very satisfied on boob alone.