D.K.
The important thing is that the bilirubin level is followed. The "number" that is concerning depends on the gestaional age (born at term or born earlier) the baby was born at and how many days old the baby is. Higher numbers at lower gestational ages and earlier in life are more concerning. If the doctors are concerned they will but the baby under phototherapy or bili lights. The light waves actually changes the bilirubin in the skin so the baby can get rid of it. Babies who are breast fed tend to have higher levels for a longer period of time - no one knows why and it's not a reason to not breast feed. Breast feeding is still best. This is one of the most common problems in the newborn. It is only potentially dangerious if levels become very high, so it's important to have it followed. Once the levels start to decrease and the baby is not under phototherapy, levels rarely need to be followed.