Week 33: There is now surfactant coating the interior of the baby's lungs, which will help the baby breathe after birth. If the baby is born after this week, there is much less risk of developing breathing problems. The baby weighs about 4 pounds (1.8 kilograms).

Week 34: The baby is continuing to grow and is now 4 pounds 7 ounces (2 kilograms), with a length of 42.5 cm or 16.8 inches. The baby urinates almost a pint a day by this week.

Week 36: The baby continues to grow bigger every day and sometime soon will "drop" down into your pelvis. The baby weighs about 5 pounds 2 ounces (2.3 kilograms) and measures 45 cm or 17.8 inches in length. This is an estimation only, since toward the end of pregnancies babies' weights vary widely. Your practitioner can palpate (feel through your abdomen) to guesstimate the weight. However, this is just a guess, so you may be surprised at the baby's actual weight at birth.