Please choose the correct ending to complete the given sentence: Health: [header] How to monitor your child's heart health [title] Contact your doctor. [step] If you believe that your child is experiencing an issue with their heart, contact your doctor immediately. It is important that they see a medical professional and receive treatment as soon as possible.

Ending1: The doctor will determine if there is any problem, and if so, they will attempt to find the source of the heart irregularity and prescribe a course of treatment. [substeps] Irregular heartbeat (or arrhythmia) may be a sign of a number of different heart problems, many of which are benign. Ending2: Although you could become famous on the internet, it is definitely a good idea to get your child doctor's attention and have your child evaluated, especially if your child is growing. [title] Keep track of each child's medical history. Ending3: Tell your doctor about any medical concerns the child may have and also let them know about your concerns. [substeps] A doctor will be able to help you identify the cause of your child's heart attack so that you can understand your child's medical performance. Ending4: If they have an elevated heart rate or are having irregularities, call 911 immediately to confirm that you are taking care of the issue. [substeps] An increased heart rate is likely a sign of an underlying condition that is preventing them from exercising regularly.

Answer format: ending1/ending2/ending3/ending4