Tia
my brother's little boy kidney was large in his first ultrasound as well
it is an indicator for Down's syndrome - but they would have looked at a lot of other signs then as well - and if they told her there was only an enlarged kidney - it probably means the baby has to pee!!!

honestly that is what it means - it took two more ultrasounds before his kidney was back to normal - and he is perfectly fine
I am sure if they suspected Downs in any way shape or form they would have expressed their concerns to her!!