In addition to how well their baby is growing, parents often are concerned about her development. Is your baby meeting her developmental milestones on time? Is she rolling over and sitting up when she should? Is she keeping up with other kids that you know who are the same age?

While sometimes there may be a problem if your child isn't keeping up with another child of the same age, this can also be normal. Keep in mind that there are very wide age ranges for each childhood milestone.

For example, most infants will be rolling over sometime between two and five months — quite a wide range of normal! The range is even larger if you also consider that some infants are rolling over before two months and others aren't rolling until after five months. And all of the kids might be developing normally.

Of course, you should talk to your pediatrician if you think your baby isn't developing on time. Delays in your child's development may be indicated if she:

• Seems to have an early hand preference

• Is delayed on many or all of her milestones and doesn't seem to be catching up

• Doesn't look at you or follow things by six weeks, which can be a sign of blindness

• Doesn't startle at loud noises, which can be a sign of a hearing loss

• Seems floppy or has poor muscle tone

• Seems rigid, with increased muscle tone

If you are concerned that your baby hasn't reached a milestone, well-child visits are a good time to talk about this and also for your pediatrician to observe which milestones your baby has reached since the last visit. In considering your child's development, your pediatrician probably will ask about her social or personal development, language, and fine and gross motor skills.