Rickets is a softening of the bones caused by vitamin D deficiency, with symptoms like bowed legs and joint pain. It is caused by deficiencies in vitamin D, calcium, and phosphorus, and risk factors include dark skin, premature birth, and anti-seizure medications. Without treatment, rickets can lead to skeletal deformities and stunted growth. Current treatments include vitamin D and calcium supplements, while the author suggests additionally giving breastfeeding infants daily vitamin D drops and increasing parathyroid hormone production to help treat rickets.