Which of the following is a normal reflex in a newborn?

The correct answer highlights grasping, sucking, and rooting as normal reflexes exhibited by newborns. These reflexes are essential for an infant's survival and development, as they facilitate feeding and bonding.

Grasping reflex, also known as the palmar reflex, occurs when an object is placed in a baby's hand, and they automatically grasp it. The sucking reflex is critical for feeding; when something touches the roof of a baby’s mouth, they instinctively start to suck. The rooting reflex helps a baby turn their head and open their mouth in response to a touch on their cheek, aiding in locating the nipple for breastfeeding.

In contrast, the other options listed include elements that do not represent typical newborn reflexes. While wiggling, smiling, and scratching may occur, they are not reflexive actions tied directly to the survival needs of newborns. Voluntary reflexes are not present at birth; rather, they emerge as the child develops motor skills. Sucking and rooting are common reflexes, but crawling and catching objects are not reflexes that newborns display; they develop these skills later as they grow and gain muscle control.