My baby's birth weight 2 800kg now he has 1 year and 2 month and weighs 8.200kg... This is normal or not??? Pls give me the answer???

A. Hello mom babies triple their birth weight by the age of one year and then they gain about 2 to 4 kgs yearly .. so according to that she has almost tripled her birth weight a little variation is acceptable as far as your baby is active for her age and able to achieve her milestones on time