Sensory-motor stage.
The baby with eight months is in the first phase of development, known as Sensory-Motor. This phase ranges from the moment of birth to the age of two, a period in which the speed of development is greater than any other stage of life. This is an essential phase in the life of the human being, where infants develop the capacity to recognize the existence of an external world and stop acting by reflex, making connections and acting autonomously.