A lot of babies are born with birthmarks or develop them within a few weeks of birth. No one knows what causes these discolored areas on the skin. Some birthmarks fade away; others remain for life and may grow and change over time.¹

Although crying is perfectly normal for a baby, it can be distressing for you and her. Colic, or extreme crying for no apparent reason, typically occurs between three weeks and three months of age, lasts more than three hours a day, at least three days a week and at least three consecutive weeks. Doctors don't know what causes it, but it usually goes away by itself by the time she reaches three months. In the meantime, try calming her with soft talking or singing or a gentle ride or walk.

Source:
"Colic," http://www.mayoclinic.com/health/colic/DS00058

If you think keeping your toddler up later will make him sleepier at bedtime, you might want to think again. Ironically, kids who are overtired may have even more trouble falling asleep. To help him develop better sleep habits, pay attention to the time he starts showing signs of sleepiness and make this his regular bedtime. A routine involving a bath, a story or soft music may help him calm down and fall asleep more easily.

Source: “6 major sleep mistakes parents make — and how to avoid them,”
http://www.babycenter.com/0_6-major-sleep-mistakes-parents-make-8212-and-how-to-avoid-th_10303189.bc