Girls, the second screening is over, everything's fine, but we have an…

Girls, the second screening is over, everything's fine, but we have another appointment scheduled because the baby was lying on his back and it wasn't easy to see much. The doctor didn't explain clearly, but she said something about the stomach, maybe an obstruction, or a valve, something like that... I don't understand. But she said it's not critical at all, even in the conclusion she didn't write anything about it. Maybe someone has had something similar said to them? I would like to know more about it, what exactly.