Diarrhea is loose, foul-smelling, watery bowel movement that occurs more than 3 times in one day. The major cause of diarrhea is an infection, usually a viral cause, and fever can be present. Other causes are formula intolerance, inability to digest lactose or sucrose (although rare in babies), and antibiotics. Most of the time, no treatment is needed. The most important thing is to keep your baby well hydrated.
Call the office if your baby is having watery stools as described above, has blood in his or her stool, has fever, or is taking in less liquid than he or she seems to be losing. Of course, call if you have a question.