Based on the fact that Helena developed different abilities in her progression of motor development, this is called the Cephalocaudal principle.
This refers to how humans develop their motor skills from infancy till they get into early childhood.
Helena as an infant first learned to control her head, then she was able to sit up and finally was able to walk. This was her development trend into childhood.
Find out more on the Cephalocaudal principle at https://brainly.com/question/11126280.
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