Smiling children do not necessarily have a higher IQ, but smiling children may be more likeable.
IQ is related to a variety of factors, and it is impossible to tell from a child’s love of smiling alone. IQ is related to both genetic predisposition and later development. Generally speaking, a baby will smile in the first ten days of life and laugh out loud at around three months. In child psychology, a child smiles because he or she is stimulated by the external environment, which is a sign of the development of the child’s IQ and EQ.
The fact that a child loves to smile indicates that the child is responding more positively to external stimuli. Although a baby’s IQ can’t be seen from whether he or she loves to laugh or not, parents can interact with their babies more in their daily lives to make them laugh and promote their intellectual development.