What can cause a baby diarrhea for more than week?

Diarrhea is a common problem in infants and toddlers, and it can be caused by a variety of factors. Some common causes of 1-week or longer diarrhea in children include:

1) Viral infection: Diarrhea can be caused by a variety of viruses, such as rotavirus, norovirus, and adenovirus. These viruses can be spread through contact with infected people or surfaces.

2) Bacterial infection: Diarrhea can also be caused by bacteria, such as E. coli, Salmonella, and Shigella. These bacteria can be found in contaminated food or water.

3) Food allergies and intolerance: Diarrhea can be a symptom of a food allergy or intolerance. Common food triggers include milk, soy, wheat, and eggs.

4) Medications: Certain medications, such as antibiotics and antacids, can cause diarrhea as a side effect.

5) Chronic conditions: Diarrhea can also be a symptom of a chronic condition, such as celiac disease, Crohn's disease, and ulcerative colitis.

6) Rotavirus: Rotavirus is a very contagious virus that can cause severe diarrhea, vomiting, and fever. It is the most common cause of severe diarrhea in children under 5 years of age.

7) Giardiasis: Giardiasis is a parasitic infection that can cause chronic diarrhea, abdominal pain, and weight loss. It is spread through contact with contaminated water or food.

8) Cryptosporidiosis: Cryptosporidiosis is a parasitic infection that can cause watery diarrhea, abdominal cramps, and fever. It is spread through contact with contaminated water or food.

If your baby has diarrhea that lasts for more than a week, it is important to see a doctor to determine the cause and receive appropriate treatment. The doctor may recommend tests to identify the cause of the diarrhea and prescribe medications or dietary changes to help manage the symptoms.