This is the week of the last menstural period before the woman gets pregnant. She does not realize at this time that she will be having a baby growing in her in just a week. This is considered the first week of pregnancy, even though her egg is not fertilized yet.
first trimester development
This is the time that is the most important part of the pregnancy, because if a miscarriage is going to happen, it is most likely to happen during this time. The fetus is developing a lot of the chatacteristics that make this little fetus that starts as a bunch of cells look like a human baby.
An egg is released and out into the fallopean tubes. The fastest and strongest sperm swim to the egg and penetrate the outerlayer of the egg, causing the egg to be fertilized. The cells in the egg start to rapidly mulitply as it travels towards the uterus.
While the cells are dividing, this is where the gender of the baby is determined, based off the male's sperm cell. Towards the end of this week is when the egg implants itself in the uterus.
The egg is now known as a blastocyst and is implanted on the endometrium. The baby is the size of a pinhead!!!
This is the time that the woman starts to realize that something is up, whether it be a physical or psychological change, the woman knows something is different with her body.
The embryo is going to be double the size it was last week by the end of this week. More hormones are produced that effect the mother. Nerves are growing and developing and forming the beginning of the brain and the spinal cord. (Baby kinda looks like a piece of shrimp).
The spinal cord of the baby is starting to close and look more like a spine. The placenta is used as a source of oxygen and nourishment for the growing embryo. (Baby is smaller than a raisin).
The heart has one chamber and it is pumping as fast as it can. The embryo is growing more to start to look like a baby, with nubs for arms and legs, and black emptiness for eyes.
The arms and legs are stretching out more and looking more like limbs. The embryonic tail is almost completely gone. The embryo's face has the features similar to a baby about to be born.
The heart is complete! The baby is moving and swimming around more. The fingers, toes, upper lip, tongue, and eyelids are developed.
The embryo is now referred to as a fetus. Fingerprints, hair follicles and nippples are starting to develop and be recognizable. (It is the size of a small strawberry)
The fetus's fingers and toes are completely separated now. They start to stick out their tongue because the tastebuds are starting to develop, The heart is completely developed and is pumping very quickly.
The fetus's nerves are not completely working yet, so it moves spontaneously all the time. It is starting to resemble a baby. The vocal chords are completely formed and they can cry, and they can also hiccup and suck their thumb.
Bone is starting to replace all the cartilage that the fetus's structure started as. Muscles are also developing more and being more organized. The fetus will probably kick the mother a lot more.
The baby has developed most of the features that make them look like a human, and they are moving and kicking their mom.
The eyes are starting to get closer together. The baby is starting to show breathing motions, and is able to pee in the fluid around them. If it is a girl the ovaries start to move down to the pelvis and if it is a boy the prostate gland is developing.
The baby starts to make fists and the arms and legs get longer and stronger so that they can touch the top of their head. The ears are starting to make their way to where they are supposed to be.
The baby is breathing. Fat is starting to form underneath the skin. The baby can hear voices that may be talking to it or to the mother.
The baby's eyes have become sensitive to light. Any of the amniotic fluid that is swallowed is recycled back out with th ehelp of the bowels.
A white skin-like materal forms on the skin to protect the baby. The mom is able to recognize when the baby is moving or sleeping.
The baby will be able to be determined if it is a girl or a boy becuase they are distinct and visible. All of the female reproductive organs are developed in this week.
The baby is able to recognize the mother's voice. A baby would be able to survive if born at this time.
The small intestines start to get to work at absorbing things necessary for the baby's body. The baby starts to gain more weight to be ready to go to the outside world.
The taste buds are forming on the baby's tongue. The baby gets into a rhythm of when they are asleep and awake.
The baby has eyebrows!!! The baby's ears are starting to develop so that they can hear better.
The baby's eyelids are visible. The lungs are developing more so that they will be able to breathe on their own.
Brain cells are growing quickly and the baby's body is now under the control of the brain. The sex organs for both genders are developed fully.
The baby is able to suck its thumb. The baby also starts to play in the stomach.
They use their eyes by opening them and closing them. The brain is growing quickly so this is the time to read and sing to the baby.