My son took a physical and did not pass.the doctor said she could hear a double heart beat.the doctor also said he has a low heart rate,should i worry?

Cardio eval: The answer to your question really relates to your son's age, any other underlying medical conditions, medications and overall fitness level. An evaluation with a cardiologist is warranted. The final answer will depend on the results of this evaluation. Try to stay calm in the interim!

Child heart rate: if you are worried have your child evaluated by a pediatric cardiologist and that can tell you whats going on.