Babies and children develop at their own pace, so it's impossible to tell exactly when your child will learn a given skill. The developmental ages and stages included in our child development section will give you a general idea of the changes you can expect, but don't be alarmed if your own baby's development takes a slightly different course.
Ages and Stages Article Index
Click on links on side bar for age appropriate Child Development
These are really great tips and I've bookmarked this. However, by the time my little one is old enough to be a teenager, I'll have probably replaced my computer a few times, at least! But, food for thought.