I actually asked my OB about this a couple of weeks ago. He said 9 out of 10 cleft lips/palates are picked up at the 20 week scan and went back through the ultrasound report with me and read out the bits talking about Bubs' little face - basically that they'd gotten a good look at all the bones and all was normal. So if nothing was picked up int he scan, you can fairly safely assume that all is well.