This article is from the Pregnancy Screening FAQ, by Lynn Gazis-Sax (email@example.com) with numerous contributions by others.
Amniocentesis will not guarantee you a normal child. It cannot detect
most non-chromosomal genetic defects, nor can it detect defects of body
structure, such as harelip, cleft palate, congenital heart disease,
hypospadias, pyloric stenosis, clubfoot or congenital hip dislocation.
Defects caused by exposure to toxic substances will also not be detected