I have 3year old girl her weight is 12kg she doesn't eat anything what should I do for her weight gain?

A. hi weight is little bit less. so ,I advise to give Healthy meal and snacks to your child. you can prepare recipes from paneer , different pulses , beans etc you can give Healthy snacks like sheera, rab, dates ladoo (see it's recipe in my profile) , golpappdi etc to your child.