Physiologic Genu Varum: This is the most common cause of bowing of the knees in toddlers, typically seen between 12 to 18 months of age. It is a normal variation in development where the legs appear bowed due to the angle of the growth plates.

Rickets: A condition caused by vitamin D deficiency, leading to softening of the bones and resulting in bowed legs. Justification: It's a common nutritional disorder that can cause bone deformities.
Blount's Disease: A growth disorder of the tibia (shin bone) that causes the lower leg to angle inward, resembling a bowleg. Justification: Although less common than physiologic genu varum, it's a well-known cause of bowed legs in toddlers.

Scurvy: A disease resulting from vitamin C deficiency, which can cause bone pain and deformities, including bowed legs. Justification: Although rare, scurvy can have severe consequences if left untreated, making it crucial not to miss this diagnosis.
Bone Dysplasias: A group of disorders that affect the growth and development of bones and cartilage, potentially leading to bowed legs. Justification: These conditions can have significant implications for the child's health and development, making early diagnosis critical.

Achondroplasia: A genetic disorder that affects bone growth, leading to short stature and potentially bowed legs. Justification: It's the most common form of short-limbed dwarfism but is relatively rare in the general population.
Metaphyseal Dysplasia: A rare genetic disorder affecting the metaphyses (ends) of the bones, which can result in bowed legs among other skeletal abnormalities. Justification: Its rarity and the specific nature of the bone involvement make it a less likely but still possible cause of bowed legs in a toddler.