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Human babies are the only babies that smile at their parents
Research states that babies learn to develop social smiles by the time they are around 6 to 8 months old. This smile is a special milestone as infants will learn to smile to show a gesture of warmth towards the mother. Smiling games are also often used as a bonding technique between a mother and her child.
Over 4 million babies are born each year in the United States
Despite this large number, it is lower by 2% of the birth rate of previous years. This indicates that fewer and fewer couples are having children. The total U.S. population now totals over 327 billion people.
