A 3-month-old baby smiles even when he is alone. Scientific research has suggested that his smile should be attributed to

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The baby's smile at 3 months of age is likely attributed to his innate motor programs, which include smiling and other facial expressions. At this age, the baby is not yet aware of reinforcements from his immediate surroundings and is not capable of being effectively trained by his mom. Additionally, motivation to learn something new is not a primary factor in a 3-month-old's behavior.

A 3-Month-Old Baby Smiles Even When He Is Alone