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Being pale and bruising is also a sign of anemia. I wouldn't worry so much about leukemia, but I would take him to the pediatrician for blood work to determine if he is anemic or not. In addition to vitamins, he may need to improve his diet. While a diet without meat can be healthy, it does require some work to make sure the vegetables and grains provide sufficient nutrition. His pediatrician may want you to consult a registered dietitian who can help you plan meals that are healthy within his food preferences. If he is a fan of smoothies (like most children), you can often hide the good veggies in with what he wants to eat.
Please let me know if you have questions.