What is the reason for the blue eyes of a 4-month-old baby?

Patient's question:

Got blue eyes, what's the reason, what might be missing? Suggest assistance. Previous treatment history and effectiveness: No treatment, what kind of assistance is needed: What's the reason

Doctor's answer:

The white of the eyes turning blue is medically known as blue sclera. This sign is mostly caused by chronic iron deficiency.
Medical advice: Iron is a crucial component of the collagen in the outer layer of the sclera. When iron deficiency occurs, the sclera may become thinner, covering the dark blue choroid underneath, which makes the white of the eyes appear blue. Chronic iron deficiency also inevitably leads to iron-deficiency anemia. Patients with moderate to severe anemia often have blueish-white sclera.
It’s best to take the child to the hospital for a check-up.