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At this point of your pregnancy, the crown-to-rump length of your developing baby is 1.25 to 1.68 inches. It is now easier to tell how much the baby weighs since he is beginning to put on some weight. Your baby weighs approximately 5 grams and is the size of a small plum! The baby has grown an incredible amount during these past few weeks, but you still aren't showing too much yet.
This week is somewhat of a landmark for your developing baby. By now, your baby's complete body plan is laid down. Your baby will continue to develop and grow for the remainder of the pregnancy. The fingers and toes have separated and the tail has disappeared now. Your baby has taste and tooth buds at this point, which will continue to develop. The brain will continue to grow at an amazing rate and nearly a quarter of a million new neurons are produced every minute! The embryonic heart is completely developed. External genitalia are not apparent until next week, but a male's testes will already be producing testosterone.
Pregnancy week 11
Your baby continues to grow and is now approximately the size of a large lime! The crown-to-rump length of your developing child is 1.75 to 2.4 inches. The weight of the fetus is approximately 8 grams at this point. The growth of your baby is phenomenal now and your baby's length will double in the next three weeks. The head is grossly out of proportion and is almost half of the baby's length.
You are almost at the end of your first trimester and while changes continue to occur quickly in your baby, they are happening at a slower rate in you. Your uterus has been growing with the fetus inside of it and is now almost big enough to fill your pelvis. Your uterus may be able to be felt in your lower abdomen, above the middle of your pubic bone.
This is the last week of the embryonic period. From now on, your baby will be called a fetus. Your baby's fingernails appear this week! External genitalia are beginning to show distinguishing features and the development of male or female will be complete in three weeks. The placenta's blood vessels increase to provide your baby with the nutrients and oxygen he needs for continued growth. Your baby's ears are gradually moving from the neck towards the sides of his head. Inside of your baby's abdomen, the intestines are developing. Because the intestines are so large, some of them project into the umbilical cord and they will return to the abdomen within the next week or two.
Pregnancy week 12
Your baby's crown-to-rump length is almost 2.5 inches and she now weighs between 8 and 14 grams! In just three weeks, your baby's size has more than doubled and begins to look a lot more human. Even though you won't be able to feel your baby moving at this time, you can stimulate him and he will squint, open his mouth and move his fingers or toes.
By the end of this week, your uterus is too large to remain completely in your pelvis. You might be able to feel your uterus above your pubic bone.
Because most of the structures are already formed at this point, few will be formed after this time. The structures will continue to grow and develop throughout the remainder of your pregnancy. Your baby's skeletal system now has centers if bone formation in most of the bones. The digestive system is capable of making contractions that push food through the bowels and it is also able to absorb sugar. The pituitary gland beginning to make hormones. You will probably be able to hear your baby's heartbeat with a Doppler at this time!
Pregnancy week 13
This is the last week of your first trimester and your baby weighs 14 to 20 grams. The crown-to-rump length of your growing baby is 2.6 to 3.1 inches. Your baby is now about the size of a peach. Fetal growth is amazing from now through about the 24th week of pregnancy.
At this point of your pregnancy, there is a steady flow of pregnancy hormones in your bloodstream. Your body will adjust to the changes and morning sickness might stop and other early symptoms will begin to ease. Because the second trimester is approaching, feelings of anxiety or nervousness may also diminish. You have probably gained some weight by now. You are losing your waist and your clothing is probably fitting snugly.
Pregnancy week 14
You are now in your second trimester! Your baby's crown to rump length is 3.2 to 4.5 inches long and he weighs approximately 1 ounce now. Your baby is about the size of the average fist.
At this time, your baby's face is becoming more developed. The cheeks and bridge of his nose appear and the ears move from the sides of his neck to much higher on his head. The eyes continue to come closer together. A big development from this week onward is the development of lanugo. Lanugo is the fine hair that grows over almost your entire baby. The hairs grow in whirled patterns that follow the grain of his skin. These patterns later give way to your baby's fingerprints. The lanugo will be shed before birth and replaced by thicker, coarser hairs. Your baby's thyroid gland has matured and starts to produce hormones. If your baby is a boy, the prostate will appear and the ovaries descend from the abdomen into the pelvis in baby girls.