Retrospective maternal report of fetal activity level was compared wit
h developmental diagnosis in 608 consecutively referred children, Mate
rnal history of fetal activity level was also obtained from 140 unmatc
hed well children in a general pediatric clinic, Fetal hyperactivity w
as positively associated with a diagnosis of child hyperactivity, and
fetal hypoactivity was positively associated with a diagnosis of menta
l retardation in the children, Maternal histories of fetal activity le
vel in the control group weakened the strength of the association betw
een fetal hyperactivity and child hyperactivity but did not affect the
association between fetal hypoactivity and mental retardation in chil
dren.