Constipation with anal fissure: This is a common condition in children, where hard stools cause a tear in the anal lining, leading to painful defecation and blood in the stool. The age of the child and the presence of blood in stool make this a likely diagnosis.

Gastroenteritis: Infections of the gastrointestinal tract can cause inflammation and bleeding, leading to blood in the stool. Viral or bacterial gastroenteritis is common in children and can present with bloody stools.
Inflammatory bowel disease (IBD): Conditions like Crohn's disease or ulcerative colitis can cause chronic inflammation and bleeding in the gastrointestinal tract. Although less common in young children, IBD should be considered in the differential diagnosis.
Food allergy or intolerance: Allergic reactions to certain foods, such as cow's milk or eggs, can cause gastrointestinal symptoms, including bloody stools.

Intussusception: A condition where a part of the intestine telescopes into another, causing bowel obstruction and potentially life-threatening complications. Although rare, intussusception is a medical emergency that requires prompt diagnosis and treatment.
Meckel's diverticulum: A congenital anomaly of the small intestine that can cause bleeding, obstruction, or inflammation. Although rare, Meckel's diverticulum can be a life-threatening condition if not diagnosed and treated promptly.
Hemolytic uremic syndrome (HUS): A condition characterized by hemolytic anemia, acute kidney injury, and thrombocytopenia, often associated with E. coli infections. HUS is a medical emergency that requires prompt diagnosis and treatment.

Juvenile polyps: Benign growths in the colon that can cause bleeding, although rare in young children.
Vascular malformations: Abnormalities of the blood vessels in the gastrointestinal tract that can cause bleeding.
Gastrointestinal lymphoma: A type of cancer that can cause bleeding, although extremely rare in children.