I try to limit them too. I have read some thing saying that too many can be harmful. But you need to weigh the benefits v risks. If you have a medical reason for having frequent scans it may be worth the risk of many. I didn't like when I had my morph scan with my last pg. The sonogropher took so long doing it, and I could feel my belly getting hot. I limit scans, but that's me personally. If you have a good reason then it may be worth it.