Diarrhea that has lasted for this long is quite serious, especially in a child this young, and it is best if you take your daughter to your family doctor. Diarrhea is usually the result of some kind of stomach infection, and lasts for no more than two, maybe three days. In most cases, no real treatment is necessary, and the infection takes its own course, with the body successfully fighting it over the course of a few days. Dehydration is the main risk with diarrhea, so all that is needed is to ensure that one does not lose too much water and salts; a good home remedy is a mixture of salt and sugar in a glass of water. In addition, it is advisable to avoid milk for a few days, and instead eat yogurt, as it contains good bacteria.
When diarrhea lasts for longer than three days, the problem may be more serious, and therefore a medical diagnosis and treatment are advisable. This is all the more important with infants and small children. Since your daughter is only two years old and has already had diarrhea for a week, you should visit your doctor immediately, without wasting any more time.
answered by M W