It is one of the earliest habits an infant develops. It is habit formed out of the sucking reflex and is soothing and calming effect on children. Is the first coordinated act a baby can do that brings comfort and pleasure.

It is also known as psittacosis, chlamydiosis or ornithosis. It a zoonotic infection caused by bacteria called Chlamydophila psittaci. It is contracted from parrots, sparrows, pigeons, ducks, hens and other species of bird.

Anabolic steroids, or anabolic-androgenic steroids (AAS), are a class of steroid hormones related to the hormone testosterone. They increase protein synthesis within cells, which results in the buildup of cellular tissue (anabolism), especially in muscles. Anabolic steroids also have androgenic and virilizing properties, including the development and maintenance of masculine characteristics such as the growth of the vocal cords and body hair.

Repetitive stress injuries (RSIs) are conditions caused by placing too much stress on a joint, and they vary in type and severity. Most RSIs are linked to the stress of repetitive motions at the computer or overuse injuries in sports. RSI in kids may occur from heavy computer or video game use, playing musical instruments, or the repetitive motion of sports like tennis.

Darier disease or Darier-White disease is an autosomal dominantly inherited disorder characterized by greasy crusty papules in seborrheic region. These crusty patches are known as keratotic papules and also known as keratosis follicularisis.