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rapid heart rate

my baby has rapid heart rate since she was weeks old.. now she's 9 mos old. what may be the cause?
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535822 tn?1443976780
Normal heart rate in 6-9 month old child is 90-130 when awake and content when the child is upset and crying it can go to 190..the concern is if it goes to 210 for several minutes there is the possibility of  cardiac arrest.If you have concerns about her heart rate speak to your pediatrician..  
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