Step-by-step explanation:
Infants will often reach for things by crawling and twisting their body before they learn to reach with their arms.
An infant's physical development begins at the head, then moves to other parts of the body. For example, sucking comes before sitting, which comes before walking.
Babies first learn to hold their heads up, then to sit with assistance, then to sit unassisted, followed later by crawling, pulling up, and then walking.