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Week 1
This is the last menstrual period of the female. The beginning of the menstrual bleeding is the first day of pregnancy. -
Period: to
Fetal Development
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Week 2
3 to 10 eggs are maturing and preparing for ovulation. The endometrium is thickening up to form a sack that will carry and protect the baby. Sperm is trying to penetrate the egg to fertilize it. Chromosomes are going to combine and determine the physical traits of the baby -
Week 3
During this time the fertilized egg begins dividing, and the gender is determined. -
Week 4
The fertilized egg is knowkn as a blastocyst- a fluid filled cluster of 60-60 cells. hCG is release into your bloodstream after the blastocyst is implanted to increase physical pregnancy signs. -
Week 5
Embryo doubles in size egg becomes muccus membrane of uterus. Placenta starts developing and embryo recover nutrition and oxygen through placenta. -
Week 6
Embryo becomes 1/4 inch, spinal cord begins to close, first blood cells and blood vessels develop, heart is formed and begins beating, brain develops into 5 parts, optic cavaties and appendage cells are in place to be developed. -
Week 7
Embryo is now 1/2 inch, heart beats with 1 chamber, arms and legs begin to grow, jaw and vocal cords begin forming the lungs, the liver, the pancreas, and the thyroid gland begin forming. -
Week 8
Embryo is now 3/4 inch, elbows and toes are becoming visible, starts practicing movements, stomach is being made and face is taking shape. -
Week 9
Embryo is 1.2 inches, nose tip, tongue and larynx begin to form. The heart is now complete. -
Week 10
Embryo becomes a fetus the size of a strawberry. The neck begins to take shape, body muscles are almost done developing, baby begins moving, fingerprints are formed, nipples and hair follicles begin to form. -
Week 11
Fingers and toes completely seperated, tastebuds develop, baby can stick out tongue and swallow. Most of the body is sensitive to touch. (If gender is male, testicles start producing testosterone.) -
Week 12
Fetus is 2.5 inches, starts moving spontaneously. Face begins to look like a baby face, pancreas produces insulin, the fingernails and toenails appear, baby can suck thumb and get hiccups baby can feel pain. -
Week 13
Fetus is 3 inches, bones replace cartilage, external genitalia is almost defined. -
Week 14
The fetus in now 3.5 inches long. The face is starting to become more visible and the baby is peeing. Bones are getting stronger and harder and hair is starting to develop. -
Week 15
The baby is 4 inches long. The legs and arms are growing longer than the head. The skin is very thin and the bone marrow is developing throughout the skeletal sysem. -
Week 16
The fetus is 5 inches long. The temperature is regulated, the fetus can breathe, and can hear voices externally. Facial muscles are developed and can be used to make expressions. -
Week 17
The baby is 9 inches if it stretches. The eyes are sensitive to light and the baby can poop. Fat is developing under the skin so the baby has energy and warmth after birth. -
Week 18
Protective layer is forming on the baby's skin. It can hear sounds, and has sleep patterns of a newborn. They have a favorite position to sleep in. -
Week 19
Placenta is growing and the heart is visible thourgh ultrasounds. The baby's genitals are devloping. -
Week 20
This is the halfway mark through pregnancy. The baby can hear voices and be familiarized with them. Growth of hair on the rest of the body is starting. -
Week 21
The baby's bone marrow is creating blood cells. The baby is slowly increasing weight due to the fat being added to the body. -
Week 22
The eyebrows, eyelids, and fingernails are developed. The tongue's tasetbuds are forming. -
Week 23
The baby is now 11 inches tall, weighs about a pound and is proportional. It can sense its direction inside the womb due to the inner ear. The pancreas is starting to produce insulin for the baby to break down sugars. -
Week 24
The baby's lungs are developing bronchioles and the baby is breathing in the amniotic fluid. The muscles in the baby's hands are improving so they can suck their thumb -
Week 25
The structure of the spine is beginning to form all the rings, joints, and ligaments. The nostrils are opening, reflexes are developing, and the nerves are more sensitive. -
Week 26
The baby is responding to touch and is very active in the womb. The baby is going through the breathing movements, but no air is actually going inside the lung. -
Week 27
This is the start of the third trimester and the look of the baby will be the same at birth. The brain is rapidly growing, and the retina of the eyes are developing. -
Week 28
The baby is now entering REM sleep and the eyelids can open now. If this baby was born prematurely they have a 90% chance of living. -
Week 29
The head of the baby is growing bigger due to the brain developing billions of neurons. The baby has more forceful movements and the mom can feel it. -
Week 30
The baby's bone marrow is producing red blood cells that are transporting oxygen and getting rid of waste. The baby is getting fatter because its storing fat. -
Week 31
The baby's major organs are functioning, the growth of the baby will now focus on maturing these organs and adding muscle mass. Loud noises may scare te baby. -
Week 32
The baby sleeps a lot. If the baby is a boy the testicles are moving towards the scrotum, and for a girl baby the clitoris is projecting. -
Week 33
Lanugo is disappearing and hair is replacing it. The baby is drinking amniotic fluid beacues its practicing breathing. -
Week 34
The baby's head is now in position for birth. The arms and legs are plump due to the fat. -
Week 35
Baby's reflexes are coordinated and responds to sounds, light and touch. The baby is getting very fat. -
Week 36
The baby is very chubby now due to the fat layers. The baby dropped into the birth canal and is ready for birth. -
Week 37
The baby is 19.5 inches and weighs up to 7 pounds. The water could break at anytime. -
Week 38
The baby is 20 inches and weighs 7.5 pounds. The development is complete and now the baby focuses on gaining weight and the soft down is now disappearing -
Week 39
The baby is in the final birthing position. The baby is in the uterus for movement. -
Week 40
This is the final week of pregnancy and can happen at anytime. The contractions can begin in any moment.
