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Pedi­atrics (also spelled pae­di­atrics or pædi­atrics) is the branch of med­i­cine that deals with the med­ical care of infants, chil­dren, and ado­les­cents, and the age lim­it usu­al­ly ranges from birth up to 18 years of age (in some places until com­ple­tion of sec­ondary edu­ca­tion, and until age 21 in the Unit­ed States). A med­ical prac­ti­tion­er who spe­cial­izes in this area is known as a pedi­a­tri­cian, or pae­di­a­tri­cian. The word pae­di­atrics and its cog­nates mean “heal­er of chil­dren”; they derive from two Greek words: (pais “child”) and (iatros “doc­tor, heal­er”). Pedi­a­tri­cians work both in hos­pi­tals, par­tic­u­lar­ly those work­ing in its spe­cial­ized sub­fields such as neona­tol­ogy, and as pri­ma­ry care physi­cians who spe­cial­ize in children.