It is that sudden involuntary jerk that a baby feels with sudden loud noise or movement. In startling movement, the baby usually extends his limbs with head movement and cries. To reduce this, parents should dim the lights, limit the loud noise, or use a white noise machine while the baby is sleeping.
Baby Startle Reflex - A Milestone for Child's Growth and Development
Neonatal Reflexes are the movement that develops soon after the child's birth. These are responsible for the body movement of the child.