THANKS FOR YOUR QUERY. Tachycardia is an abnormally fast heart rate more than 160 times per minute. In newborns a even higher rate is normal. Rather, we usually get concerned with low heart rates, not high ones, unless there is some specific concern about other related ailment. Tachycardia usually does not last long enough to cause serious damage. There are many different types of tachycardia. Usually, they are caused by a problem with the heart s electrical system. Treatment depends on what is causing the tachycardia. Certain medicines can be given to lower the heart rate. But a heart rate of 160-200/min is absolutely normal for a newborn. We might get concerned only if it is higher. If the child can maintain a heart rate in this range without any medication, I would not suggest any medicines. But if it does not, the medicine may be continued. In that case, a ECG in order to look into the cause, would be more important. Further interventions will depend on that. Since the doctors did not feel that there is any associated anomaly, I do not think that it is something to be concerned about. Often the stress hormones in mother just before the delivery, could also be linked to the tachycardia and the rate should be back to normal once the effect dies out. HOPE THAT HELPS.