Definitely underweight for age. So for stool it’s normal, no worries about that. Requires 1000kcal diet/day maybe divided in 5-6 servings - 180-200 ml of milk with spoonful of sugar 3- 4 times, one grated rice based serving with pulse and green vegetables with a bit of butter or ghee mashed up, one grated wheat porridge with pulse and vegetable again, one serving with a few boiled potatoes mashed, one serving of a piece or two of bananas, one serving of fruits like apple, papaya or likes all mashed. You can also try out the yellow of a boiled egg daily. Mind you don’t add salt any where. I think this should be sufficient for catch up growth. Make feeding pleasurable ,not a punishment by forced feeding. *Forced feeding has to be avoided*

No worries... Give calorie dense diet...add ghee or butter in food