There is not any validated questionnaire for assessing malnutrition in pediatric community. However, by knowing the weight and height of children, you are able to calculate z-scores of BMI using the anthroplus software of WHO. this is the only validated way to evaluate malnutrition prevalence in children.
You can use this reference to get various questionnaires which you can adjust to your needs. PAHO. (2004). In Cataloguing‐in‐Publication PHL (Ed.), ProPAN: Process for the promotion of child feeding. Washington, D.C: PAHO. Best of luck.
There is not any validated questionnaire for assessing malnutrition in pediatric community. However, by knowing the weight and height of children, you are able to calculate z-scores of BMI using the anthroplus software of WHO. this is the only validated way to evaluate malnutrition prevalence in children.
I recommend you check out the questionnaire from the Demographic and Health Survey for Pakistan. It will have standardize language and protocols for collecting anthropometric data and infant feeding practices.
better you use WHO methods of assessment of malnutrition among children. Even free downloadable soft wares which are simple can be used which fives Z-score and you can easily grade their malnutrition status,