Rickets can be treated with Vitamin D3; first, we need to understand the pathology of the disease. It is a metabolic, obstructive disease caused by a deficiency of Vitamin D. Often, this deficiency leads to impaired calcium absorption in the body, causing osteoporosis and bone deformity. Infants typically exhibit symptoms like square skulls, pigeon chests, outward flaring ribs, bow legs, and knock knees. Additionally, it affects the baby's sleep quality. The lack of Vitamin D can increase the baby's neural excitability, leading to poor sleep and easy waking. Moreover, severe cases can affect growth and development. Presence of these symptoms should be confirmed by laboratory testing of 25-hydroxy Vitamin D3 to determine specific levels and choose the appropriate dose of Vitamin D3 supplementation. It is also encouraged to promote children's physical activity and exposure to sunlight to enhance the body's synthesis of Vitamin D, which is beneficial for bone development. (Medication should be administered under the guidance of a professional doctor.)