title: The growth and development of four XYY infants.
mesh_terms: D001519:Behavior; D001827:Body Height; D001835:Body Weight; D002657:Child Development; D002675:Child, Preschool; D003878:Dermatoglyphics; D005500:Follow-Up Studies; D006128:Growth; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007361:Intelligence Tests; D007621:Karyotyping; D008297:Male; D009048:Motor Skills; D010551:Personality; D011581:Psychological Tests; D012729:Sex Chromosome Aberrations; D013060:Speech; D013997:Time Factors