Stage 0 - Your baby settles into a routine of feeding and sleeping, growing more alert and investigating his or her world. He or she grows more in this period than at any other time in his or her life.
Stage 1 - Your baby is developing very quickly. He or she learns to sit up by themselves and becomes an explorer. Their awareness increases as they crawl around and investigate new parts of their environment.
Stage 2 - Babies become toddlers. They are more independent and explore their world by crawling, walking, climbing, and running. They experiment with how things work, and can manipulate small objects.
Stage 3 - Your child is continually on the go, with increased strength and coordination, and their vocabulary grows rapidly.
Stage 4 - Your child is more agile. They develop the muscular control and concentration to master precise finger and hand movements.