Prenatal Development: Week 11
From this week until week 20, your baby will be growing rapidly - increasing in size from about 1.7 to 2.4 inches (44 to 60 millimeters) and 0.3 ounces (8 grams) to just over 6 inches (about 16 centimeters) and 10.5 ounces (or 300 grams). To accommodate all this growth, the blood vessels in the placenta are increasing both in size and in number to provide the baby with more nutrients. Your baby is now weighing about 8 grams and the head of your baby seems to take up 1/2 of the baby's size at the moment. Your baby's irises will start to develop this week and finger nails will appear. Your baby's reproductive organs begin to develop rapidly this week and the external genitalia will be recognizable.
Nourishing your baby usually requires that you gain weight - and in most cases, the recommended weight gain is 25 to 35 pounds over the course of the pregnancy. Because of the baby's weight, the placenta, the amniotic fluid, increased blood volume and an enlarged uterus and breasts, you can expect to gain between 2 and 5 pounds during the first trimester, 13 pounds during the second trimester, and 11 pounds during the last trimester. If you were overweight or underweight before pregnancy, your health care provider may have different recommendations for weight gain.
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