baby is 8.5 months and her weight is 6.5 is it okay or i have to consult

A. According to the age the weight is seem a little less though I am not aware about what the birth weight is so I’ll just tell you the simple funda where you calculate the way to know whether this is appropriate or not the child should gain 500 g every month on the minimum right now your child should be 4.25 kg more than the birth weight so evaluate accordingly