Amniotic fluid is what fills that comfy pool your baby-to-be floats, flips, and lounges around in for nine months. Aside from cushioning him from trauma, it also helps to maintain a constant temperature in the womb, prevents against infection, and supplies him with plenty of nourishment.

At three weeks pregnant, you are about one week from your expected period. During week three of pregnancy, your baby is a tiny ball of rapidly dividing cells called a blastocyst. At the end of this week, it will attach to the uterine wall.

There are many reasons why toddlers might have trouble falling--and staying--asleep. They may be teething, testing limits, napping too much during the day or be frightened of the dark. One way to help a toddler who has trouble falling asleep is to add a bedtime snack that promotes sleep.

Light bleeding in early pregnancy can actually be quite normal, but it may be startling to an expectant mother. Some women may not realize they are even pregnant in the first month. The American Pregnancy Association recommends wearing a pad or pantyliner to assist in monitoring the amount of blood that is shed.

Fatigue and dizziness are symptoms that can be related to many medical conditions, such as treatment for cancer, substance abuse, alcoholism, altitude sickness, or strict dieting.

Baby formula is expensive, and a hungry baby can gobble up 30 or more ounces per day, costing parents as much as $3,000 per year, or more if their baby needs specialized formula.

At 37 weeks, a pregnancy is full term--if the baby is born now, it will not be premature. Ideally, however, the pregnancy will continue until 40 weeks. This final stage of the pregnancy may be difficult. The cumulative weight gain may make the mother uncomfortable, even while sitting or lying down.

Teenage pregnancy is a socially, economically, physically and emotionally complex issue. StayTeen.org reports that three out of 10 teen girls in the U.S. find themselves pregnant at least once before age 20. The National Campaign to Prevent Teen and Unwanted Pregnancy relays that approximately 47.

Wetting the bed is a common condition for children under six years of age and usually is caused by physiological factors. However, bedwetting, also known as secondary enuresis, may return later in adolescence or even adulthood.

Physical development is the process that starts in human infancy and continues into late adolescent concentrating on gross and fine motor skills as well as puberty. Physical development involves developing control over the body, particularly muscles and physical coordination.

Infant males often have swollen testicles. Testicular swelling present at birth may be related to the birth process and vanishes within a few days.

Working parents often place their infants in child care centers or have a caretaker watch them. Hara Estroff Marano, a Psychology Today writer, reports that researchers have found an array of effects on babies who are in non-parental care for at least 10 hours per week.