A baby’s smile is a magical moment that all parents anticipate, but you’ll have to wait four or five months to see your baby properly laugh. Like tears, laughter is one of our primary modes of communication.
An infant’s smile evolves through several stages, from the first fleeting smile to the point at which he begins to laugh aloud. Babies’ smiles are a reflex action in the first few weeks of life. They are not a random reaction to anything and primarily occur during sleep. Their smiles in response to external stimuli can only be considered genuine social expressions after about a month.
They usually smile when they see someone they know or when they see someone they don’t know. They transition from smiling to laughing, which is manifested by noises and gurgling, between the ages of four and five months. They begin to find amusing the jokes of those around them, such as being thrown in the air, tickled, or playing hide and seek. Sometimes they laugh for no apparent reason at everyday things that strike them as amusing.