In their study, the two investigators assessed early motor milestone acquisition among 4-month-olds (71 who slept supine, and 12 sleeping prone) and 6-month-olds (50 supine and 22 prone), and evaluated the effect that infants' positioning while awake woul
In their study, the two investigators assessed early motor milestone acquisition among 4-month-olds (71 who slept supine, and 12 sleeping prone) and 6-month-olds (50 supine and 22 prone), and evaluated the effect that infants' positioning while awake woul
在她们的研究中，两位研究者评估了4个月大的婴儿（71个仰睡，12个俯睡）和6个月大的婴儿（50个仰睡，12个俯睡）的早期运动里程碑的获得，并评价了婴儿醒时的姿势会有什么效果。