13 weeks: Urine Forms
Thirteen weeks into a pregnancy, the fetus’s intestines have moved from the umbilical cord to it’s abdomen. The fetus is also beginning to form urine and discharge it into the amniotic fluid.
Fingerprints have formed on it’s tiny fingertips, it’s veins and organs are clearly visible through the still-thin skin, and the body is starting to catch up with the head — which makes up just a third of it’s body size now. If it’s a girl, she now has more than 2 million eggs in her ovaries. The fetus is almost 3 inches long
(13 - 16)
Tissue that will become bone is also developing around it’s head and within it’s legs.
The brain is fully developed and the fetus can suck, swallow, and make irregular breathing sounds. Fetus can feel pain. Fetal skin is almost transparent. Muscles tissue is lengthening and bones are becoming harder. Liver and organs produce appropriate fluids. Eyebrows and eyelashes appear and the fetus makes active movements including kicks and even somersaults.
Thoughts?
“Before we make any moral decisions about abortion, we should ask: what makes killing wrong in the first place?”
- Abortion Opposing Viewpoints Series
(As in if someone is killed in our society, what makes it wrong? How do we decide if it is wrong?)
12 weeks - fingernails develop
The most dramatic development this week: reflexes. The fetus’s fingers will soon begin to open and close, toes will curl, eye muscles will clench, and the mouth will make sucking movements. In fact, if a parent prods the abdomen, it will squirm in response, although the parent won’t be able to feel it. It’s intestines, which have grown so fast that they protrude into the umbilical cord, will start to move into it’s abdominal cavity about now, and it’s kidneys will begin excreting urine into it’s bladder.
Meanwhile, nerve cells are multiplying rapidly, and in the fetus’s brain, synapses are forming furiously. It’s face looks unquestionably human: Its eyes have moved from the sides to the front of it’s head, and it’s ears are right where they should be. From crown to rump, it is just over 2 inches long (about the size of a lime) and weighs half an ounce.
Week 11: Fetus’s genitals develop
At the beginning of the 11th week of pregnancy, or the ninth week after conception, the fetus’s head still makes up about half of its length. However, it’s body is about to catch up, growing rapidly in the coming weeks.
This week the fetus’s eyes are widely separated, the eyelids fused and the ears low set. Red blood cells are beginning to form in the liver. By the end of this week, your baby’s external genitalia will start developing into a penis or clitoris and labia majora.
By now the fetus might measure about 2 inches (50 millimeters) long from crown to rump and weigh almost 1/3 ounce (8 grams).the size of a large lime
10 weeks: Neck begins to develop
**At ten weeks, the fetus is now officially classed as a foetus, meaning ‘offspring’.
By the 10th week of pregnancy, or eight weeks after conception, the fetus’s head has become more round. The neck begins to develop, and eyelids begin to close to protect it’s developing eyes.The fetus is able to swallow the amniotic fluid it floats in, and may even suck it’s thumb. The preferred hand at just 10 weeks could reveal whether it will be left- or right-handed, according to researchers from Belfast University
All organs are present and begining to work together, the fetus has tooth buds and fingernails.Newly formed limbs can bend.
1 inch in diameter, size of cherry tomato.
Week 9: Toes form
When the parent is 9 weeks pregnant, the embryo’s body parts and proportions continue to develop and change quickly.The embryo is probably about an inch long now. This is a period of rapid growth for the fetus. Over the next three weeks its body will double in length.
The embryo’s arms grow, develop bones and bend at the elbows. Toes form, and the embryo’s eyelids and ears continue developing and its tail has all but disappeared.
During this week of pregnancy, some embryos have even been shown to suck their small thumbs, and they have begun to make facial grimaces and even swallowing motions. Tiny teeth buds begin forming. As do internal reproductive organs such as ovaries and testies.
By the end of this week, the embryo might be about 2/3 inch (18 to 22 millimeters) long. The size of a grape.
Week 8: Eyes are Visible
The embryo is reactive to its environment inside the amniotic sac where it swims and moves. Hands and feet can be seen. Elbows are present, and arms and legs extend forward, and fingers have begun to form. The body’s trunk area is getting longer and straightening out. The neck is starting to grow, separating it’s large head from it’s body. In the heart, the valves are present and distinct.
It’s facial features are continuing to develop, eyelids are forming, and the jaw is fusing to shape a mouth. The tip of the nose is visible. The shell-shaped parts of the embryo’s ears also are forming, and it’s eyes are visible. The upper lip and nose have formed.
By the end of this week, the embryo might be about 1/2 inch (11 to 14 millimeters) long.
Week 7: Fetus’s Head Develops
Major organs have all begun to form. The embryo has developed its own blood type, unique from the parent. Hair follicles and nipples form and knees and elbows are visible. Facial features are also observable. The eyes have a retina and lens. The major muscle system is developed and the embryo is able to move.
Seven weeks into a pregnancy, or five weeks after conception, the embryo’s brain and face are rapidly developing. Tiny nostrils become visible. The arm buds that sprouted last week now take on the shape of paddles.
By the end of this week, the embryo might be a little bigger than the top of a pencil eraser.
The embryo’s head is the largest part of the body - indicative of the rapid brain growth that has been occurring. All four chambers of the heart are now in place. Intestines are also developing but they are not yet encased inside the fetus’s body as yet. They bulge out into the umbilical cord. The crown to rump length of the growing fetus measures at 4 to 5 mm.
Week 6: The neural tube closes
Growth is rapid this week. Just four weeks after conception, the neural tube along the embryo’s back is closing and the fetus’s heart is pumping blood.
Basic facial features will begin to appear, including passageways that will make up the inner ear and arches that will contribute to the jaw. The embryo’s body begins to take on a C-shaped curvature. Small buds will soon become arms and legs.
The uterus has already expanded from the size of a plum to the size of an apple. If you could see the fetus, it would look a bit like a seahorse. The spine is still curved and it has grown a long tail, and there are tiny bumps where arms and legs will soon start to appear. The head, which is very large in proportion to the rest of its body, already has folds that will soon develop into eyes and nose.
(Source: mayoclinic.com)
Week 5 The Embryonic Period Begins
Week 5
The embryo’s tiny heart begins to beat by day twenty-one. The brain has developed into 5 areas and some cranial nerves are visible. Arm and leg buds are visible and the formation of the eyes, lips, and nose has begun. The spinal cord grows faster than the rest of the body giving a tail like appearance which disappears as the embryo continues to grow. The placenta begins to provide nourishment for the embryo.
Week 4: Implantation
Hormones produced by the embryo stop the females menstrual cycle. By the time it reaches the uterus, the rapidly dividing ball of cells — now known as a blastocyst — has separated into two sections. The inner group of cells will become the embryo. The outer group of cells will become the membranes that nourish and protect it. On contact, it will burrow into the uterine wall for nourishment. This process is called implantation. The placenta, which will nourish your fetus throughout the pregnancy, also begins to form
(this is getting more difficult as I go along, every health and hospital site writes something different. If you see mistakes please let me know)
Week 3 of Pregnancy
At this point, the blastocyst, or developing embryo, is looking for a spot to implant in the uterus. Early formation of the central nervous system, backbone, and spinal column has begun. The gastrointestinal system has also begun to develop with the kidneys, liver, and intestines forming. The heart has begun to form.
week 2 of pregnancy
There’s no fetus yet, but your body is preparing for ovulation and, ultimately, conception. Wondering how you can be 2 weeks pregnant before your fetus is conceived?
The uterus lining starts to building up in preparation for the fertilized egg to implant itself once your period ends, and assuming you have succeeded in your mission to conceive.
Conception typically occurs when you are two weeks pregnant, or two weeks after your period starts. Even while you’re menstruating, your body is getting ready for pregnancy.
* An egg, maturing within one of your ovaries, releases.
* This process, called ovulation, usually occurs approximately 11 to 14 days after your period.
* After ovulation, the egg moves into your fallopian tube, which connects your ovary and uterus, and waits to be fertilized.
* If you have intercourse during ovulation, you might become pregnant!
* Sperm can live in your body for up to six days, but your egg, once released during ovulation, must be fertilized within 12 to 24 hours.
* At this point, your egg is 1/200 of an inch - too small to see with the naked eye.
1st week of pregnancy
The first week of pregnancy actually begins with the start of your last menstrual period. Why? It’s hard to pinpoint exactly when your egg becomes fertilized, but the date of your last cycle is a more accurate starting point. Your doctor will calculate your due date by counting 40 weeks from the start of your last menstrual period.
Trying to cover basics before I dive into the issues
“In the Womb” from National Geographic
Perhaps a good place to start is research on conception to birth






