my baby is 8 month at 5 month his weight 7.4 kg n he was chubby now his weight 9.3 he was very thin why his chubby gone his weight is normal or not

A. Hello mom as they are growing they increase in height as well , and that is pretty much normal to occur so not to worry , babies almost double their birth weight by 4 to 6 .months and then triple by age of 1