Remember your baby's first kick? Or was that just your tummy rumbling? Last month your baby's movements were gentle flutters. By the end of this month she'll be much stronger. You won't have any doubt that your little one is on the move.

Your baby is beginning her rapid weight gain now. Her muscles are developing. So are her motor skills. Her bones are storing calcium and getting harder. Her rolls, tumbles, kicks and pokes may have the power to startle you. Especially when you look down at your belly and catch sight of your baby's "calisthenics."

Some babies are more active than others. Some are active in daylight, others at night. Ask your doctor if you have questions about the timing, frequency or intensity of your baby's movements.

Last month your baby became aware of sounds inside and outside the womb. This month, she will get used to certain sounds and stop reacting to them. This process is called habituation. It's one of the simplest, earliest forms of memory.

Let's say you live on a busy street. Your baby was startled when she heard car horns blaring for the first time. But now she can learn to "tune it out." She'll refine this skill after birth. With luck she'll sleep soundly through traffic jams and much more.

Your baby is surrounded by amniotic fluid, not air. Do you wonder how she will breathe at birth?

During pregnancy, you breathe for your baby. Her lungs won't function until she's born. But she's making preparations now to breathe on her own. Her lungs will begin to make surfactant this month. This fatty substance will cover the inner lining of the air sacs in the lungs. This allows them to expand more easily. So when your newborn needs to take her first breath, she'll be ready.

By the end of this month, your baby will weigh 1-1/2 to 2-1/2 pounds. She'll also begin sleeping and eating at regular intervals.