Immature neonates have slim thread-like villi of uniform length. More matured children have rougher villi with initial club-like expansion of the tip. Later there is a triangular broadening at the base of villi and at last tongue-shaped villi occur. They develop quickly in early days of life of an immature child and simultaneously with broader square villi and crest-like formations. This phenomenon is far more expressed in immature neonates than in matured ones.