1. A child's leg shape changes gradually as they grow, rather than being fully formed at birth.2. From birth to 18 months, a child's legs typically have an O-shaped appearance, which is known as genu varus or bow-legged.3. Between 18 months and three to four years of age, there may be a slight X-shaped appearance, known as genu valgus or knock-kneed.4. From three to four years until seven years of age, the leg shape progressively aligns with adult standards, though there may still be a slight outward curve.5. By the age of seven, a child's leg shape becomes largely stable and resembles that of adults.6. These changes in leg shape are natural and do not require concern or orthotic correction.7. O-shaped and X-shaped legs in children are normal physiological phenomena and usually do not require treatment.8. These changes in leg shape during the early walking stages are usually a part of the normal developmental process and should not be cause for worry.9. Between 12 and 24 months, the O-shaped leg will naturally straighten, which is a normal physiological process of genu varus.10. Subsequently, the X-shaped leg gradually appears and reaches its peak between three and four years of age.11. By around seven years old, the lower limbs have developed sufficiently, typically showing a 6° valgus angle, which is normal.12. Females are more likely to have varus than males, which is a normal gender difference.13. Parents should not overly worry about their child's leg shape changes, as these are all part of normal physiological development.