WordNet (r) 3.0 (2006):

pediatrician
    n 1: a specialist in the care of babies [syn: baby doctor,
         pediatrician, pediatrist, paediatrician]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "pediatrician":
   anesthesiologist, cardiologist, chiropodist, dermatologist,
   eye doctor, eye-ear-nose-throat specialist, geriatrician,
   gerontologist, gynecologist, immunologist, internist, neurologist,
   obstetrician, oculist, ophthalmologist, orthopedist,
   otolaryngologist, otologist, pathologist, pediatrist, podiatrist,
   psychiatrist, radiologist, serologist, skin man, specialist