Walking is a big developmental milestone and is accompanied by other developmental leaps. Your baby's brain and body is working double time, leaving a slightly less tolerant tot.

Sitting independently is a skill that many babies master between 7 to 9 months of age. They are able to roll in both directions. Some may even be scooting back and forth, getting ready to crawl. Some others may experiment with pushing themselves into a tripod position. In this position, the baby is sitting supported by one or both hand on the floor.

Crawling is baby's first method of getting around efficiently on his own. In the traditional crawl, she will start by learning to balance on his hands and knees. Then they figure out how to move forward and backward by pushing off with his knees. At the same time, she will be strengthening the muscles that will soon enable him to walk.

By age 4 months, babies can easily bring toys to their mouth. They use their fingers and thumb in a claw-like grip to pick up objects. Because at this age babies will instinctively explore objects by putting them in their mouths, it is important to keep small objects out of reach to prevent accidental swallowing.