my baby is 15 months old and his weight is 11 kg. is it ok?

A. 8.4 to 12.7 kg is the average weight range for this age group. But it also depends on the baby's birth weight. Your child seems to be fine. As long as the baby is taking feeds and eating properly, poops and pees regularly and is active and healthy u need not worry much about the weight. Keep feeding the baby a balanced and healthy diet.