my baby is 10 months old but her weight is only 7.8 kgs is she is healthy or not

A. Its Less than the usual so your child should have been somewhere around 9 KG as of now that’s what I think but since You haven’t mentioned the birth weight I can tell you that the doctor say sometimes three time of the birth weight is sufficient for 12-month-old child or 10 KG which ever is higher so you can go ahead with that too