Rickets is caused by a deficiency of vitamin D in infants and young children, leading to disturbances in calcium and phosphorus metabolism and resulting in skeletal abnormalities as a characteristic of this chronic nutritional disease. Typical symptoms can include changes in the bones, especially in the fastest growing parts of the skeleton, and can affect muscle development and changes in neural excitability. Symptoms such as a "ping pong ball" head, square skull, pigeon chest, funnel chest, and eversion of the rib margins are also observed. Diagnosis is made through examinations such as vitamin D levels and skeletal X-rays. Dwarfism, on the other hand, is a growth disorder caused by a deficiency of growth hormone from the anterior pituitary gland before puberty. Its clinical manifestations are primarily growth disturbances, characterized by a short, proportionate stature. Adults with this condition often retain a child-like appearance, and their bone development is delayed with bone age younger than their chronological age. Intellect corresponds to their age, and sexual development may also be disrupted.