Hi their I ve been to the hospital with my almost 4 month old and his heart rate was tachy at 180 but improved overnight and was back at hospital with him last night worried about his breathing and his heart rate was normal but today a home nurse has come out for a check up on him and its at 170 again all this is why his sleeping also so no reason for the increased heart rate do you have any suggestions as to what it may be as the hospital kinda just takes me as a over worried parent but I never had this problem with my 18 month old daughter at this age thank you