It is common to have frequent cough and cold at this age but get her checked by a pediatrician for any issues. She will stop having frequent illness after 5 years of age if no major issues. Weight is on lower side of normal. That will also improve when she is above 5-6 years. Give her hot water and hot drinks only to drink. Steam inhalation as soon as cold starts. Don't allow to watch mobile and screens. Take her out to parks daily 2 times. Give fresh fruits and vegetables. Don't give packaged foods. Give home cooked fresh foods only. Create a good atmosphere at home by listening to calming songs like bhajans etc.

Hi it's better to consult  Pediatrician to rule out any medical causes for recurrent cold and cough

Hi, It is normal for the kids to fall sick frequently. Nothing to worry. She is underweight, feed her frequently and give calorie dense food. Give 2 different fruits daily and a healthy diet to improve immunity.

It is not normal to have cough & cold