Here are some key characteristics of infancy:
* Physical growth: Rapid increases in size and weight, development of motor skills like crawling, walking, and grasping.
* Cognitive development: Learning about the world through senses, developing language skills, and starting to understand cause and effect.
* Emotional development: Forming attachments to caregivers, expressing emotions like joy, sadness, and anger, and beginning to develop self-awareness.
Essentially, infancy is a time of profound change and learning, laying the foundation for future development.