Behavior Changes Although a baby's activity level, appetite, and cries normally vary from day to day, even hour to hour, a distinct change in any of these areas may signal illness. Skin Color Changes The color of a baby's skin can often help identify possible problems in another area of the body. It is important for you to call your doctor if certain skin color changes occur. Breathing Problems If you listen closely, you’ll notice that your baby’s breathing isn’t like yours. Babies breathe much more frequently and with different patterns than adults. Here’s how to recognize normal breathing in your infant—and how to spot signs of respiratory distress. Gastrointestinal Problems If your baby seems fussy and you’ve fed and changed him, he may have an upset stomach or colic. But don’t worry, there are lots of things you can do to make your little one more comfortable and keep both of you calm. Natal Teeth Natal teeth are teeth that are present when the infant is born. They are usually the infant's primary teeth (or baby teeth) that have come in early. Colic Though the name sounds like a disease, colic is really just a term for excessive crying in an infant. Unfortunately, nobody knows for sure what causes colic, but there are several theories and possible risk factors for the condition. Fever in A Newborn Detailed information on fevers in children Hyperbilirubinemia and Jaundice A newborn with this condition has too much bilirubin in the blood. Bilirubin causes a yellowing of the baby's skin and tissues. This is called jaundice.