Stage transitioning in the sensorimotor development of Down's syndrome infants.

The relative amount of time necessary to move from stage-to-stage during the sensorimotor period was examined among a group of 30 Down's syndrome and 12 non-retarded infants. Stage transitioning was examined for the four transitional points between Stages II and VI for the seven branches of sensorimotor development on the Uzgiris-Hunt scales. The findings showed that the Down's syndrome infants generally took longer to move from one stage to the next even after their slower pace of development was taken into consideration.