What is the term for the reflex where the baby moves its legs when held upright with feet touching the floor?

The term that describes the reflex where the baby moves its legs when held upright with feet touching the floor is stepping.
The stepping is an involuntary movement which newborns make when learning to adjust to their new world outside of the womb.
These motions typically disappear between 3 and 6 months of age with the majority ending at 4 months.