Hi Margy,
I have a daughter with a heart problem. I think anytime you are concerned you should talk to a doctor. Mother's often have a sixth sense about things. Here are some things for you to look for. A blue tinge to the face of the lips, swelling in the eyelids, feet, hands etc. complaining of a fluttery feeling in his chest. If you see any of those things get to the doctor and insist on an echo. Good luck. Michelle