A retrospective study examined early neurodevelopmental behaviors of children 
with spastic diplegia, spastic hemiplegia, and quadriplegia (spastic, athetoid, 
or mixed) who had been followed up longitudinally in a high-risk infant 
follow-up clinic. Compared with peers with normal outcomes, children with all 
three types of cerebral palsy had significantly lower scores on the Bayley 
Mental Scale at 4 months of age; children with hemiplegia and quadriplegia also 
scored significantly lower on the Bayley Motor Scale. On the Movement Assessment 
of Infants at 4 months of age, the children with hemiplegia and quadriplegia 
showed significantly higher risk scores than the nonhandicapped group. The 
Movement Assessment of Infants was more than three times as sensitive as the 
Bayley Motor Scale in detecting motor abnormalities in 4-month-old infants with 
diplegia and more than twice as sensitive in detecting early abnormalities of 
hemiplegia. At 1 year of age, however, the Bayley Motor Scale was extremely 
sensitive in picking up motor deficits in children with all three types of 
cerebral palsy.