My 20 month son's weight is 11.7 kg, height 84 cm . is he underweight?

A. No Everything seems fine to me according to the age of your child and there is nothing that is not all seems good to me according to the age and also continue feeding your child in the same manner with growing age the weight is also going to increase we believe if your child gains a minimum of 2 to 3 kgs in a year then that’s a decent weight