Infancy: birth to 12months

Infants from birth to the first couple of weeks of life, spends the majority of their time sleeping, eating, and being changed throughout the day.

A cognitive milestone for two month old infants is, they pay close attention to faces and follow things with their eyes.

A cognitive milestone for four month old babies is that they respond to affection, and let their caregiver know if they are happy or sad.

A cognitive milestone development for six month old infants is that they love to look at themselves in the mirror.

A cognitive milestone for 12 month olds is they cry when their mom or dad leave them.

A language milestone for two month old infants is, they coos and make gurgling sounds when speaking to them.