Hi gina, at the hospital where I had my scans done, it also had a sign up saying no children in the room during the scan. But I took my daughter anyway (whos is 6) as I want her to be as involved as possible. They didnt object to her coming with me and my partner. I think its like redcrx, so long as they dont cause chaos, it isnt a problem. If you are really unsure, why dont you give the ultra sound department a call explaining you have no one to look after them and therefore would it be ok for them to come in with you.