What is a one-sentence summary of the following article?
Encircle the baby's thigh with your thumb and forefinger. Gently stroke their leg from their thighs down to their feet, then rub their feet with your thumbs. Curl and uncurl their toes. Repeat with the other leg, then gently bend and unbend the knees at the same time.  You can start with any part of the baby's body. Many like to start with the legs and feet in order to help the baby transition from play time to calm time more easily. The baby may kick and squirm, having fun as you massage their legs and feet. Remember to be very gentle; don't pull on their legs or exert too much pressure as you bend their knees. If they straighten their legs in protest, don't force them to bend them. This part of the massage has the most profound calming effect. Start by massaging their chest from the center outward, away from the heart, smoothing your hand over their skin as though you were smoothing open the pages of a book. Then, massage their tummy in a clockwise rubbing motion. This mimics the path of digestion. Keep doing this part of the massage until your baby seems calm.  Remember that if you're massaging as part of playtime, you can make your baby feel stimulated by massaging your baby's chest toward the heart, rather than away from it. Be careful not to tickle your baby's belly as you massage it. Use your fingers to make circles on their head. Gently “walk” your fingers across their forehead and cheeks, and draw a smile on their lips. Steer clear of the eyes and nose, since massaging too close to these areas might make them uncomfortable. Gently turn your baby over so they're lying on their stomach. Massage their back by smoothing your hands from the center of their back outward. Don't grip their shoulders and knead as you would an adult's; instead, use circular motions to rub their shoulders and lower back.

Summary:
Massage their legs and feet. Massage their chest and tummy. Massage their head and face. Massage their back.