my baby is 2 ninth old..all of sudden he looks weak..his cheeks and face become dull

A. if child is not gaining proper weight you need to consult your doctor to rule out the cause and mostyr of the time it could be because of nutritional deficiencies like nutritional anemia and some other factors like malabsorption any chronic disease like congentital heart disease or some chronic infection specially urine infection or worm infestation should be checked if required .