My baby's weight is 7.4kg from march until now... no change at all, but he is so active & moves around so much.. he's turning 9 months in 2 days.. Should I be worried?

According to the World Health Organization growth charts for children, the average 9-month-old baby boy weighs about 20 lbs (about 9kg). The lower percentile at this age will weight about 16 lbs (about 7.25kg) and a large baby boy, will be about 25 lbs (11.3kg). I reckon as long as your baby is healthy, happy and active, it is fine. Don't worry, Mommy :) http://www.cdc.gov/growthcharts/who_charts.htm