A paediatrician is a medical doctor who specializes in the care of children. Paediatricians have undergone special training in the health and illnesses of infants, teens and young adults, and the majority of paediatricians are certified by the American Board of Paediatrics after passing a comprehensive exam. Paediatricians provide preventive health care for children in good health and medical care for children who are acutely or chronically ill. They also provide parents with support and advice with issues such as growth and development, safety and prevention, nutrition, and emotional wellness to foster a lifetime of good health.