Anal Fissure: This is a common cause of bloody stools in children, often due to constipation or hard stools that tear the anal mucosa, leading to bleeding.

Gastroenteritis: Infections of the gastrointestinal tract can cause bloody stools, especially if the infection is caused by certain bacteria like E. coli or Salmonella.
Intussusception: A condition where a part of the intestine slides into another, which can cause bowel obstruction and bleeding. It's a common cause of intestinal obstruction and bleeding in young children.
Food Allergy or Intolerance: Allergies to foods like milk or soy can cause gastrointestinal symptoms, including bloody stools, especially in infants and young children.

Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can present with bloody stools and are important to diagnose early to prevent complications.
Hemolytic Uremic Syndrome (HUS): A condition often associated with E. coli infections, leading to kidney failure and requiring prompt diagnosis and treatment.
Meckel's Diverticulum: A congenital anomaly of the small intestine that can cause bleeding due to the presence of ectopic gastric mucosa.

Juvenile Polyps: Benign growths in the colon that can cause bleeding, though they are less common in very young children.
Vascular Malformations: Abnormal formations of blood vessels in the gastrointestinal tract that can cause bleeding.
Gastrointestinal Lymphoma: A type of cancer that can cause bloody stools, though it is exceedingly rare in young children.