What type of reflexes should include the sucking movements of a newborn baby that occur when it is first applied to the chest?

What type of reflexes should include the sucking movements of a newborn baby that occur when it is first applied to the chest? What is the mechanism of this type of reflexes?

The sucking reflex is present in all healthy newborns and is a reflection of the maturity of the child. This reflex belongs to the type of unconditioned reflexes. In the first days of life, a sucking reflex is formed in the child. Any irritation of the lips of the child causes a response. The nuclei of the cranial nerves (trigeminal, facial, vestibular, glossopharyngeal, vagus and sublingual) located in the brain stem are involved in the implementation of the sucking reflex.

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