When Do Babies Start Smiling?

Newborn infants often smile—especially while sleeping—shortly after birth. This type of smile reflects a state of physical comfort and inner contentment. Infants’ smiles generally fall into two categories: one is spontaneous, occurring naturally even in the absence of others.

When Do Babies Begin to Smile?

Social smiling—triggered by parental interaction or playful stimulation—typically emerges around three months after birth. This type of smile signifies positive, reciprocal communication between the infant and caregiver and differs fundamentally from the reflexive smiles observed shortly after birth. Initially, babies may respond with a smile only once in every three attempts at playful engagement, but this likelihood gradually increases over time. Psychologists have observed that, compared with female infants, male newborns tend to make less eye contact and smile less frequently. This suggests that parents should engage more actively with baby boys—talking, interacting, and playing with them—to support their language development; by ages two to three, such early interaction can help boys achieve language skills on par with those of their female peers. Children who smile frequently tend to develop cheerful, optimistic, and emotionally stable personalities—traits highly conducive to building strong interpersonal relationships, fostering curiosity, encouraging exploration, and ultimately supporting cognitive development.

Knowledge Extension: Effective Ways to Make Your Baby Smile

1. Engaging Sounds

Babies may respond to playful sounds such as baby-like giggles, kissing noises, squeaks, or the “raspberry” sound made by blowing air through pursed lips. These auditory stimuli are often more captivating than ordinary speech.

2. Gentle Touch

Light tickling or gentle blowing on your baby’s skin provides novel and pleasurable sensory input. Parents can try kissing their baby’s hands or feet—or softly blowing on their tummy—to elicit laughter.

The above outlines when babies begin to smile. We hope this information is helpful to you.