A babysitter in New Jersey accused of fatally shaking a toddler described as she tried to save the child from choking on apple sauce in 2012.
Michelle Heale testified before a jury in Monmouth County on Tuesday as she demonstrated on a doll how she hit 14-month-old Mason Hess between his shoulder blades.
Heale said she "may have hit him harder'' than she should have and the child's head "snapped back fast'' and "like a ragdoll, he went completely limp.''
Under cross-examination, Heale said she couldn't "think of an instance why you would shake a baby.''
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The toddler was flown to a children's hospital in Philadelphia, where he died three days later.
Doctors later determined the boy suffered severe brain, spine and retinal damage from a violent shaking.