My baby is 9 months old and her weight is only 6.5 kg, is it normal at her age?

Same as my baby mommy. Underweight daw yun mi. Kasi si baby ko 6.6kg lang din last visit namin sa pedia. 8-9kg daw normal weight sa 9 mos. Nag suggest si doc ng gamot na pampagana at enfamil catch-up 3-4 times a day. So far, in one week, nagging 7.5kg si baby.