What to Expect at Different Ages
Kids develop through different age phases. It's important that the parents can track and understand their child's development for potential issues. Here is a great resource which maps out all the typical phases from new born to adulthood by Amanda Morin from understood.org. Social and Emotional Skills: What to Expect at Different Ages.
However, keep in mind that every child is a unique being. It's possible to see your child develops at a different speed than the map. Don't worry if your child develops faster or slower or even in slightly different order. And find a professional physician for advice if you do concern.