这个好像是很authoritic的，
不过screening 只是说如果你的baby有，可能需要进一步evaluate
"The M-CHAT (modified checklist for autism in toddlers) is
an excellent parent-report screening instrument that can be
employed by primary care physicians. It is particularly
usefuly in that the questions are designed to address
the crux of what differentiates autism from other
development disabilities.
A Child fails the checklist when two or more critical items
are failed OR when any thress items are failed. It is
important to emphasiz
