4 months: Redundant axons are gone, and synaptic fields are complete {brain development, 4 months}. Interhemispheric fibers receive myelin sheaths.
4 months: Laughter first appears {cognition development, 4 months}. It requires safe or playful moods and unexpected situations.
4 months: Grasp reflex ends {reflex development, 4 months}. Infants can have bowel movements at eating time.
4 to 7 months: Eye accommodation is same as for adults, meaning plays role in perception, and babies can eat cereals and vegetables {fourth stage of development}.
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Date Modified: 2022.0225