My 5 year old son has a little yellowish hands. also for last few weeks he sometimes complains of tummy aches, just around dinner time. any suggestion?

Check his diet: Sometimes slight yellow to orange discoloration can indicate too many yellow/orange vegetables and is a harmless condition called carotenemia. Tummy aches around dinner time could be behavioral or he might need a snack a little earlier before dinner as could be "hunger pains". Constipation is a consideration also. A visit with your pediatrician for more info can be helpful.

Abdominal Pain: Aside from caroteinemia for the yellow discoloration, make sure the abdominal pain is not from plumbism. We still check lead level until 5 years old.