Child development is a process every child goes through. This development process starts from birth to age 6. it includes learning and mastering skills like sitting, walking, talking, skipping, and tying shoes etc. Children learn these skills, are called developmental milestones, during predictable time periods. Developmental milestones for each child is individual and may meet a little earlier or later than his peers. You may have heard people say things like, "he was walking before he turned 10 months, much earlier than his older brother" or "she didn't say much until she was about 2 years old". This is because each child is unique and will develop at his or her own pace.
It is the ability of child to learn and solve problems. For example, this includes a 2 month old baby learning to explore the environment with hands or eyes or a 5 year old learning how to do solve a addition problem in math.
It is the ability of child to communicate with others, it includes helping themselves and self control. For examples, a 8 month old baby smiling or a 6 year old boy knowing how to take turns while playing.
It is the ability of child to use language and understand. For example, a 8 month old baby saying his first words or 2 year old naming body parts, or a 5 year old learning to say different words with correct pronunciation.
It is the ability of child to use small muscles like their hands and fingers, to pick up and hold small objects, For example, hold a spoon or turn pages in a book, or use a crayon to draw.
It is the ability of child to use large muscles. For example, a 12 month old baby learns to pull up to a stand with some support, and a 5 year old learns to ride bicycle.