No two children develop exactly alike, but there are stages known as “developmental milestones” that can help guide you through looking at your child’s development. A milestone is a skill that a child learns within a specific time frame, for instance learning to walk. Milestones usually develop in sequence, which means a child will generally need to develop certain skills before they can develop new ones. For example, children must first learn to crawl and pull up to a standing position before they are able to walk. Each new skill a child achieves builds on the last milestone developed, so all milestones are important.