How do you know if your baby has cancer?
This is not something you would know generally unless a doctor was looking into curious symptoms. Generally the first indicator that something may be worrisome is during an exam. Many times blood work will raise red flags and further testing needs to be done. Keep in mind that pediatricians may be looking for things during a regular check up that you don't even realize. If you trust your instincts to report worrisome symptoms and trust your pediatrician to know what to look for then your baby is in good hands.