Final answer:
By the end of the fourth month, an infant can generally roll from supine to prone, marking an important developmental milestone in their physical development.
Step-by-step explanation:
Infants typically develop the ability to roll from supine to prone by the end of the fourth month after birth. This is a significant developmental milestone that also accompanies other abilities such as lifting their head 90 degrees while lying prone, sitting up with support, and holding their head steady for brief periods. This advancement is part of the natural progression of physical development in infants as they grow and gain new motor skills.