My DS had prominent kidneys at his 20 week ultrasound. Do you know what the measurements were? My DS had one kidney which was 0.5mm higher than what they call "normal" and the other was 1mm above normal. The sonographer wasn't overly worried, that they worry when the kidneys are more than 5mm over normal range, but that I would have to go back at 28 weeks for another scan. Nothing had changed at 28 weeks, so they said once bub is born he would have to have an ultrasound at 6 weeks to see if the kidneys had gone back to normal size. He went back at 6 weeks and everything was perfect. Apparently the hormones in pregnancy can sometimes dilate the kidneys a little. When I was googling, everything I could find out on it didn't seem that terrible. Like the absolute worst case scenario was if the kidneys didn't resolve their size then the bub may need a small op to fix them. Did you find out the gender? It sounds like the sonographer wasn't overly concerned as he said you might need to come back. Not sure what the prominent stomach means sorry. Hope everything works out for you!!