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Transcript of Trimesters
Pregnancy is measured in trimesters from the first day of your last menstrual period (LMP) and normally lasts about 40 weeks from conception to the birth of a baby.
This time is roughly divided into 3 periods: the first trimester, second trimester and third trimester.
-the first trimester is from week 1 to the end of week 12
-the second trimester is from week 14 to the end of week 26
-the third trimester is from week 27 to the end of the pregnancy
During the first trimester your body undergoes many changes.
Hormonal changes affect almost every organ system in your body.
These changes can trigger symptoms even in the very first weeks of pregnancy.
Your period stopping is a clear sign that you are pregnant.
Week 1 - Week 12
Other changes you may experience during the first trimester include:
Tender, swollen breasts.
Cravings or distaste for certain foods
Constipation (trouble having bowel movements)
Need to pass urine more often
Weight gain or loss
Your baby's heart beats with a regular rhythm.
The arms and legs grow longer, and fingers and toes have begun to form.
The sex organs begin to form.
The eyes have moved forward on
The face and eyelids have formed.
Your baby is nearly 1 inch long and weighs less than 1/8 of an ounce.
The Baby at 8 Weeks
The external sex organs show if your baby is a boy or girl.
Eyelids close to protect the developing eyes. They will not open again until the 28th week.
Head growth has slowed, and your baby is much longer.
The Baby at 12 Weeks
FUN FACT ABOUT 2nd TRIMESTER
The baby is now developing sleep patterns
Sense of touch develops
Baby begins looking more like what s/he will look like at birth
Although the baby's lungs aren't fully formed the baby practices breathing during these weeks
The baby start to absorb hearty minerals from the intestinal tract such as:
The baby’s pupils can constrict, dilate and detect light entering his or her eyes.
The baby’s limbs start to become chubby.
The baby also begins to gain weight rapidly (about a half a pound a week).
Baby’s bones fully developed
but they’re still soft and pliable.
A pint and a half of amniotic fluid surrounds the baby at this time of pregnancy.
These weeks major development is the eyesight continues to develop, though not very acute.
Another fun fact is the baby might have a good head full of hair by week 30.
The baby’s central nervous system has matured so that it can actually control its own body temperature.
Baby is full term at 37 weeks
The baby’s organs are ready to function on their own.
The baby’s head might start descending into your pelvis. If the baby’s head is not down your health care can help you with ways to deal with it.
The most common fetal developmental action of this period is the firm grasp the baby has established.
Also the brain can weigh up to 14 ounces during this time.
The placenta supplies the baby with antibodies to fight infection after birth.
The average weight for a newborn is 7 1/2 pounds (about the size of a small pumpkin) and approximately 20 inches long.
This is the week of delivery.
An important Facts to know about this week includes:
The skull bones are not yet fully developed at this time
Fortunately, this allows the doctors to mold the head a little bit if it is a snug fit in the birth canal.
If the head is misshaped due to this molding the mother can rest assured it is only temporary.
Week 40 Due Date Arrives
Hair and Eye Brows develop
begins to suck thumb)
Smiling begins & baby's heart pumps 25 quarts of blood a day now
Baby's digestive system begins waste build up
Baby can now hear inside the womb! (Like the baby's mom's heartbeat)
A waxy substance forms on
the baby's skin that will stay with him/her through the rest of pregnancy
The baby's heart is beating twice as fast as his/her mother's heart
PARENTS CAN FIND OUT BABY'S SEX
Lung Development: A wetting agent forms that keeps from the lungs sticking together
Nerves around the mouth develop that will help the baby to nurse after birth
By the end of this trimester baby is now 2 pounds and almost 13 inches in length!
Week 4: Implantation
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 will become the cells that nourish and protect it.
On contact, it will burrow into the uterine wall for nourishment. This process is called implantation.
The fifth week of pregnancy, or the third week after conception, marks the beginning of the embryonic period.
This is when the baby's brain, spinal cord, heart and other organs begin to form.
Fetal development: Third trimester. (2013, July 13). Retrieved from http://www.mayoclinic.com/health/fetal-development/PR00114/NSECTIONGROUP=2
Third trimester. (2013). Retrieved from http://www.babycenter.com/pregnancy-growing-baby-weeks-28-40
Prenatal care in your third trimester. (2013, March 22). Retrieved from http://www.nlm.nih.gov/medlineplus/ency/patientinstructions/000558.htm
Pregnancy. (2013). Retrieved from http://www.gerber.com/pregnancy/growth_and_development/pregnancy_calendar.aspx