What should be weight of 3 month old

Take high fiber low fat diet. Drink lot of water everyday. Take small and frequent meals at regular intervals of 2-3 hrs. Avoid outside food. Ask me directly for customized diet plan for you. 

You can take murmura bhel / roasted chana / fruit chat / sprouts and vegetable sandwich at office as a healthy and low carbs high fiber snack to loose weight .

Don't skip meal in fact take small and frequent meals at regular intervals to lose fast.