Many structural congenital heart defects present at birth, and most ar
e diagnosed by 1 year of age. Arrhythmias also are common during this
time and may be particularly problematic. Identification of infants wh
o may have a serious underlying congenital heart defect is important b
ecause many require prompt medical and surgical treatment. This articl
e is a guide to the clinical findings that may assist the practitioner
in the evaluation of infants with potential cardiac problems.