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It is probably not a concern. It isn't considered an irregular heart beat unless it happens a certain amount of time within a given period. The reason you start giving these tests on them while they are still young is it gives them a base line. Now when you do it next year they will be able to compare and that. and as you have them done every year they can look and see patterns. If they are growing in frequency that is something that this would show. I hope you are also having a regular echo. The holter will only tell you the electrical impulses to the heart. The echo will tell them if there are physical changes to the heart as in thickening or thinning of the chamber walls. You are hoping they never find anything.