Human Development During Pregnancy

By Mrs. Fucoloro’s 7th Grade Science Class

St. Clement School

St. Louis, MO

2005-2006

The First Trimester of Pregnancy

By: Beth, Olivia, Jen, Abby, Catherine,

Kate, Sarah, Kate, Tim, Olivia, Ali,

Taylor, Mary,

and Allie

Features

Week 4: The placenta develops

Week 6: Umbilical cord develops, first heart beat begins, buds for arms and legs form

Week 8: elbows and feet begin to grow, teeth develop under gums

Week 9: Bones and cartilage begin to develop, the fingers are short and webbed

Week 10: It’s moving!!! Most joints have been formed

Week 11: Now considered a fetus, blood begins to circulate between the baby and the uterus, placenta starts to function

Week 12: Fingers and toes separate, hair and nails begin to grow, genitals take on gender characteristics

Features, continued

Organs

• Most of the organs like kidneys, liver, pancreas, bladder, intestines, bronchi, and skin have formed by the end of the first trimester

How Long?

• Week 7: baby is 1/3 of an inch long or the size of a grain of rice

• Week 12: baby is 2 inches long

• At the end of the first trimester the baby will weigh approximately half of a pound

Senses

• All sense organ have begun to form, but it will be many weeks before they are completed to the point where the baby will be able to use them

Extra Info

• Week 5: embryo has three layers: the ectoderm, endoderm, and the mesoderm and the skin remains transparent

• Week 11: blood will begin to circulate in between the baby and the uterus

• Week 12: kidneys begin to form and excrete urine and the muscles in the intestinal wall practice digesting food

• During the first trimester the brain and head grow rapidly. “Ridges demarcate the three sections of the brain.” –www. Visibleembryo.com

• Week 6: baby’s first heart beat is recorded

TIMELINE

Works Cited

• “pregnancy week-by-week guide.” 98-06. StorkNet family. 3 April 2006. http://www.pregnancyguideonline.com 

• “The visible embryo” not given. National Institute of Health. 3 April 2006 http://www.visembryo.com/baby/index.html

• “Fetal Development:How your baby grows.” babycenter.com 2006.Baby Center LLC.30 March 2006.http://www.babycenter.com/fetaldevelopment/

• “First Trimester”. Pregnancy week by-week guide. Doerr Consulting/Stork Net Family. 30 March 2006.http://www.pregnancyguideonline.com/

Sean, Drew, Nick, Eric, Brian, Patrick, Mary, Molly, William, Brendan, Rebecca, Claire and Colleen

Features• The following begin to

develop: head-face, eyes, retina, eyelids and eyebrows, ears, bones in the middle ear, nostrils

• vocal cords, intestines, pancreases, arms, hands, fingernails, hair, legs, toenails, fat, placenta, brain, muscles.

Organs

• Week 17: Heart may be pumping up to 25 quarts of blood each day

• Week 18: Prostate glands grow in boys.

• Week 20: Uterus starts to develop in baby girls

• Week 21: Heart strengthens

Weight and Inches

• 4 months: the baby’s length is 4.5 inches

• 5 months: the baby’s length is 10 inches.

• 6 months: the baby’s length is 12 inches and weighs more than a 1 pound

Developed Senses

• Eyes and ears develop and move to their proper position throughout the trimester

• Week 26: brain waves for sight and sound

• Week 27: eyes start opening and retinas start growing

Extra Info!

• Baby’s bones begin to harden

• Baby is moving a lot but the mother cannot always feel these movements

• The baby’s head is half the size of the body

• Fine hair is all over the baby’s body

• Baby’s eyes are large and opened

TIMELINE

Work citedWeb“Pregnancy week-by-week.” Doree Consulting

Baby Center 4/3/2006, unknown

http://www.pregnancyguideonline.com/

Author unknown Visual Embryo “Visual Embryo Timeline”

4/3/2006 unknown

http://www.visembryo.com/baby/index.html

Baby center LLC. StorkNet “Fetal Development: How Baby Grows.”

4/3/2006, unknown

http://www.babycenter.com/fetaldevelopment/

Imageshttp://www.pregnancy.org/pregnancy/fetaldevelopment2.php

http://nycpastor.typepad.com/photos/uncategorized/zaizaismile.jpg

http://pregnancy.about.com/library/ultrasounds/us0016c.jpg

By: Michael, Justin, Jamey, Alex, Kevin, Tyler, Matthew, Chris, Maggie, David, Mary Margaret, Ellie, Anthony, Katie and Kevin

Body Features• The eyebrows and

eyelashes finish forming and eyes function

• Hair on head continues to grow

• Leg actually starts to look like a leg, a little bony

• More body fat is collecting around bones

• The arms are small but the bones are growing

Organs

• During the third trimester of pregnancy almost all organs have formed

• Only the lungs need to be developed more because if the baby was born now it would have a hard time breathing

• By then end of the third trimester the baby is ready to be born because all essential organs are in place

lifedynamics.com

Length & Weight

• The average weight from weeks 28-40 is 2 to 7.5 lbs.

• The average length from weeks 28-40 is 14.8 to 20 inches

SENSES

• By week 32, the baby is up to 4 pounds and all five sense are functional

• In 2005 nearly 500,000 In 2005 nearly 500,000 babies born before the babies born before the 3 trimester did not gain 3 trimester did not gain all their normal all their normal functionsfunctions

• Albert Einstein was Albert Einstein was born in the beginning born in the beginning of the 3 trimesterof the 3 trimester

• 82% of twins weigh less than 6 pounds

Timeline

Bibliography• 1. “Baby Center.” 1997-2006. “What your baby

looks like at seven months.” 4/2/06 www.babycenter.com/fedaldevelopment/

• 2. “Visible Embryo.” no copy right date. Visible Embryo. 4/2/06.

www.visembryo.com/baby/index.html• 3.“Storknet’s.” 1998-2006. Pregnancy Week-

by- Week Guide. 4/2/06. www.pregnancyguideonline.com

• 4. “Show Me News.” no copy right date. Extra Information. www.showmenews.com/2005/babylove/2005.