Deficiency of which vitamin causes knock- knee, bow legs and pigeon chest in children?

Vitamin D

Deficiency of Vitamin D causes Rickets, which is a bone disease generally found in children. This disease causes bowed legs and other bone deformities like pigeon chest.

Children with rickets do not get enough calcium, phosphorus, or Vitamin D—all of which are important for healthy growing bones. This can also lead to loss of teeth and alopecia.