The growth and development of a child is a wonderful and beautiful thing to experience for a parent. A child's growth is a complex and ongoing process. However, it is also important to remember that as a child grows they should reach key "milestones," although some children develop differently and these milestones may occur at a different age without it being a significant problem. Nevertheless, it is important to observe and take note of your child's development, both to better your understanding of their growth and to help your pediatrician at checkups.

The following website has excellent guidelines for child development:
Developmental Milestones