L.B.
Hi J.,
My 3 yr. old daughter just went through the ordeal of having an echo in Dec. It's totally harmless, but with her age she ended up freaking out, didn't want the wand with the jell anywhere near her, etc. The place I had to take her let them watch a video, bring any lovely/doll/animal that they might like and a sippy cup. That's the only problem we had with it. She has a heart murmur is the reason she had to have one. We ended up seeing a specialist from Chapel Hill since she didn't let them do the echo on her. I wouldn't worry about things...possibly your son won't be as frightened. (I know that this isn't all that positive, but it's what I had to deal with) Hope that all goes well!!