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Last day of Menstrual cycle.
The Endometrium has finished shedding and the body heads into the Proliferative phase. -
Proliferative Phase
The Uterine lining is beginning to rebuild itself. -
Period: to
40 Weeks of Pregnancy
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Ovulation Occurs
The egg is released from the Ovarian Follicle. -
Fertilization Occurs.
The sperm has met the egg and a zygote is formed. -
Morula Forms
The morula is a ball of cells that will soon become a blastocyct. -
Blastocyst is formed.
The morula is formed into a blastocyst, which will implant into the Uterine linning on Sept. 12. This will become the embryo. -
Implantation Occurs
The Blastocyct implants into the Uterine lining. -
Placenta Forms
The placents provides the fetus with nourishment. It allows the fetus to exchange respiratory gasses. It also eliminates waste. -
Ectoderm
The ectoderm gives rise to the epidermis and other tissues that will later make up the nervous system. -
Mesoderm
The mesoderm formes muscles, cartilage, the dermis, notochord, blood and blood vessels, bones and connective tissue. -
Endoderm
The endoderm gives rise to the epithelium of the digestive and respiratory sysetems. It also helps with the formation of some of the organs in the digestive system. -
The Gut Forms
The foregut, midgut, and hindgut form. -
Structure Formation
Heart can be seen.
Forebrain, midbrain, and hindbrain are forming. -
Blood Vessels
Blood vessels start to form and become showable -
Systems
Repiratory system starts to grow.
Circulatory system function begins.
Heart starts to beat. -
More Stuctures
Liver forms.
Mouth and throat may begin to rapture. -
Lungs and Spinal Cord
The lungs begin to bud.
The spinal cord begins to form. -
More Structures!
The small and large intestines form.
The trachea forms.
The arm and leg buds form.
The umbilical cord emerges. -
Nerves!
The first of the nerve fibers form. -
Moving
The movement begins. -
Bones!
Hand movement begins.
Bones in the collar bone form.
Bones in the lower jaw form.
Cartilage for ribs start to form. -
6th Weeks Structures
The nose, mouth and ears begin to form.
The pituitary gland has formed.
The heart beats about 100-160 times per minute. -
Hands and Feet
Hands and feet form during the 7th week although they do not look like hands or feet, but more like little paddles. -
8th Week.
Webbed fingers and toes are starting to point out of the "paddle" hands.
Eyelids start to cover the eyes.
Breathing tubes extend from its throat down to its branching lungs.
Nerve cells are branching out to one another.
Its "tail" is nearly gone. -
Size
At this time the fetus is about the size of a kidney bean. -
9th Week
The organs, muscles, and nerves are starting to kick into full gear.
They eyes are fully formed, but they eyelids will not open until around 27 weeks.
The placenta is produced enough to produce hormones. -
Its starting to look normal!
The mouth, nose, and nostrils are becoming more destinct.
The "tail" is completely gone. -
Maturing
It is about the size of a grape now and will be growing at a rapid rate from here on out.
It weighs just a fraction of an ounce. -
Week 10.
This is the start of what is called the fetal period.
The time where the organs and the tissue rapidly grow and mature. -
Organs
Kidneys, intestines, brain, and liver are in place and starting to function properly. -
Developments of week 10.
The limbs start to bend.
Tiny nails form on fingers and toes.
Peach fuzz is starting to grow.
Spinal nerves are bending to stretch out of its spinal cord. -
Size by week 10.
From crown to rump, he's about 1 1/4 inches long. -
Week 11
Its hands will start opening and closing into a fist.
The movements will become more frequent due to full functioning muscles.
It may also hiccup, but the mother will not be able to feel any of these movements for another month or two. -
Week 12 Reflexes
The toes will curl, its eye muscles will clench, and its mouth will make sucking movements. -
Kidneys
The kidneys star to excrete urine into the bladder. -
Facial Movement
The eyes slowly move to the front of the face.
The ears take their place at the sides of the head.
The fetus is starting to look more and more like a human each week. -
Size at 12 Weeks
It is about two inches long and weighs about half an ounce. -
Big Head!
Its body is now starting to catch up with its head wich now only make of just a third of the body.
The baby is now three inches long and weighs nearly an ounce. -
1 over 2 to go.
This marks the end of the moms first trimester, and the beginning of the second. -
Week 14 Improvements
It can now squint, frown, grimace, pee, and possibly suck his thumb.
Its liver now starts to secrete bile. -
Week 15
It can sense light, even though its eyelids are still fused shut.
There's not much for it to taste at this point, but it is forming taste buds.
The mom can finally see what sex the baby is. -
Sex Determination
The way doctors can tell what sex the baby is, is through an ultrasound. Determining the sex happens around the 15th week. -
16th Week
The baby will double its weight and add inches to its length. Right now, it is about the size of an avocado: 4 1/2 inches long (head to rump) and 3 1/2 ounces. Its legs are much more developed, its head is more erect than it has been, and its eyes have moved closer to the front of its head. Its ears are close to their final position. -
Skeleton
The babies skeleton is starting to harden during week 17. -
Week 18
If it is a girl, her uterus and fallopian tubes are formed and in place. If it is a boy, his genitals are noticeable now, but he may hide them during an ultrasound. -
19th Week (more senses)
The babie's brain is designating specialized areas for smell, taste, hearing, vision, and touch. -
Important Events in Week 19
The baby weighs about 8 1/2 ounces and measures 6 inches, head to bottom — about the size of a large heirloom tomato. Its arms and legs are in the right proportions to each other and the rest of its body now. Its kidneys continue to make urine and the hair on its scalp is sprouting. -
The Vernix
The vernix is a waxy coating on the baby to prevent its skin from pickeling in the amniotic fluid.
The vervix is formed in week 19.
The Lanugo is also produced. -
Week 21
The baby's eyebrows and lids are present now, and if you're having a girl, her vagina has begun to form as well. -
Week 24
The baby's growing steadily, having gained about 4 ounces since last week. That puts it at just over a pound. Since it is almost a foot long. -
Week 25
The baby is beginning to exchange its long, lean look for some baby fat. As it does, its wrinkled skin will begin to smooth out and it will start to look more and more like a newborn. It is also growing more hair — and if you could see it, you'd now be able to discern its color and texture. -
Week 26
The baby is inhaling and exhaling small amounts of amniotic fluid, which is essential for the development of its lungs.
The baby is continuing to put on baby fat. It now weighs about a pound and two-thirds and measures 14 inches (an English hothouse cucumber) from head to heel. If you're having a boy, his testicles are beginning to descend into his scrotum — a trip that will take about two to three days. -
Premature Baby
During week 27 the baby can be born prematurly and be okay as long as it is watched very closesly -
2 down 1 to go.
The mother is two trimesters into the pregnancy. She just has one left. -
Week 28
The baby is developing billions of neurons in her brain and adding more body fat in preparation for life in the outside world. -
Week 30
The baby is about 15.7 inches long now, and weighs almost 3 pounds. A pint and a half of amniotic fluid surrounds the baby, but that volume will decrease as it gets bigger and takes up more room in the uterus. -
Week 31
The baby is heading into a growth spurt. It can turn its head from side to side, and its arms, legs, and body are beginning to plump out as needed fat accumulates underneath its skin. -
Week 34
The baby now weighs about 4 3/4 pounds and is almost 18 inches long. Its fat layers — which will help regulate her body temperature once it is born — are filling it out, making it rounder. The baby's skin is also smoother than ever. Its central nervous system is maturing and its lungs are continuing to mature as well -
Weight Gain
The baby is almost fully grown. During the rest of this time it will basicaly just be puttin on fat. -
Its all over
The mother has now completed the third trimester. -
Due Date
The baby is ready to come out.
