Discuss ectopic pregnancy at greater length. (Refer to lesson plans.)
Baby's prenatal development
Directions Read through this Powerpoint and compare to your prenatal webquest you completed last week. Use both resources to compile a prenatal development timeline for the baby*we will add what mom goes through later
The Three Stages of evelopment Zygote – Conception through Implantation • Implantation occurs approximately 2 weeks after conception Embryo – Implantation through the 8th week Fetus – 9th week through Birth
Week 3 - Conception Conception is the moment when the sperm and egg unite. This begins the zygote stage. – Conception thru implantation Now there is an increased risk for an ectopic pregnancy.
Week 4 There are three layers to your baby – ectoderm, mesoderm, and endoderm – These layers will form the baby’s organs & tissues – Arm and leg buds begin developing, but are not clearly distinguishable. The placenta has also begun to form and is producing important hormones including hCG. There is movement of rudimentary blood through the main vessels.
Week 8 Baby: – Everything that is present in an adult human is present in the embryo. – Gender has been determined, but external genitalia cannot be seen. • “indifferent penis” – Brain takes control of body systems.
The amniotic sac filled with fluid forms around the baby Amniotic fluid protects the embryo and cushions it from any falls or bumps mom may have The placenta develops – The placenta is full of blood vessels that carry food and oxygen to the baby through the umbilical cord.
Umbilical Cord Brings nourishment to the baby and takes waste away It is firm – like a garden hose full of water Generally not flexible enough to loop around the fetus, but may occur
Week 9 Eyelids are fused shut and will stay that way until week 28. All joints are working – knees, elbows, etc. Baby can make a fist and suck their thumb. Baby is about the size of a grape.
Week 10 Baby can squint, swallow, and frown. Fingernails, toenails, and hair become visible this week. Baby is actively swallowing amniotic fluid. Baby is about the size of a lime.
Week 11 Baby begins to urinate Baby can smile Bones are beginning to harden. Baby is very active even though you can’t feel them yet.
Week 12 Baby can kick, curl and fan their toes, make a fist, move their thumbs, bend their wrists, turn their head, open their mouth and press their lips together. Baby practices breathing. The spinal column becomes bony. Baby is 3 inches long and weighs 1 ounce.
Week 13 Your facial expressions start to resemble your parents. Your movements are graceful and reflexes vigorous. Vocal chords are formed, but without air, you cant yet cry. Sex organs are apparent.
Week 14 Babies heart pumps several quarts of blood. Fine hair has grows on their head. Nails are well formed. The growth of the head slows down and the rest of their body catches up. The neck is formed. Legs and arms lengthen. Baby is 4 inches long and weighs less than 2 ounces.
Week 15 Baby – 5 inches long and weighs 2 ounces. – Ears are beginning to look normal – Eyes are moving to the front of the head
Week 16 Baby – 6 inches long and weighs 2 1/2 ounces. – Head, neck and spine curve to follow the circular space of the uterus. Baby now occupies all the room in Moms pelvis. – The first thin transparent layer of skin begins to replace the temporary protective membrane. – Their eyes are still closed and the nose, eyes and lips and ears are shaping up. – The sex is discernible on ultrasound.
Week 17 Baby – 6.5 inches long and weighing 4 ounces – Sense of hearing is fully developed – Fat tissue is forming • Regulates body temperature and metabolism
Week 18 Baby – 7 inches long and 5.5 ounces – Protective coating is forming around baby’s nerves
Week 19 Baby – 7.5 inches long and weighs 7 ounces – Hair is beginning to grow – If you are having a girl, she already has 6 million eggs formed in her ovaries.
Week 20 – The Halfway Point Baby is about 8 inches long and weigh about 9 ounces. Baby can pedal their legs, make crawling movements, roll over, turn somersaults and swim. Covered with vernix which helps protect their skin.
Week 21 Baby – 8.5 inches long and 12 ounces – Actively swallowing amniotic fluid
Week 22 9 inches long and 14 ounces. Taken on the form of a tiny newborn. Now you can lift your eyes to eye level and turn them slowly from side to side for long periods of time. Your eyes can also dart quickly back and forth, sometimes smoothly, sometimes jerkily.
Week 23 Baby – Finally 1 pound and 10 inches long
Week 24 Baby – Brain is growing rapidly – Taste buds are forming – Lungs are developing • Produce surfactant which allows the air sacs to inflate easily
Week 25 Baby – Oil and sweat glands are functioning. – Baby can open their eyes when the eyelids become unsealed. They scan the darkness and may blink if there is a sudden noise. – They drink the amniotic fluid and could survive outside the womb if born early. – www.gravityteen.com/prenatal/ninemonths.cfm • Month 6
Week 26 Baby – 13 inches long and 2 pounds – Development may seem insignificant at this point, but baby is maturing to survive in the world
Week 27 Baby – 14 inches long and 2.25 pounds – Has a regular sleep cycle • Unfortunately it’s not the same as yours!
Week 28 Baby – 14.25 inches long and 2.5 pounds • Remember, baby gains the most weight in the last few weeks – Indentions start to form in baby’s brain – Eyebrows and eyelashes are visible
Week 29 Baby – 14.5 inches long and 2.75 pounds – Brain, muscles and lungs are maturing rapidly
Week 30 Baby – Using all four of your senses: vision, hearing, taste and touch. – Recognize Moms voice. – There is still enough space to straighten out. – The amniotic fluid is reduced by half to allow you room to grow. – Gaining weight quickly and by the end of the seventh month may weigh 4 pounds.
Week 31 Baby – 15 inches long and 3.5 to 4 pounds
Week 32 Baby – Skeleton is formed but bones are still soft – 15 to 17 inches long and 4 to 4.5 pounds
Week 33 Baby – Bones are hardening except for the skull
Week 34 Baby – 15.5 to 17.5 inches long and 5 to 5.5 pounds – High survival rate if born at this point
Week 35 Baby – Skin is beginning to thicken with a layer of fat stored underneath for insulation and nourishment. – Antibodies are building up. – Developed taste buds seem to have given them a sweet tooth. – Responding to familiar noises such as Moms voice and music. – Will gain two more pounds this month.
Week 36 Baby – 16 - 19 inches long and 5.75 - 6.75 pounds – Lanugo and vernix are starting to disappear • Baby swallow this along with amniotic fluid to produce meconium, or baby’s first bowel – Should be in the head down position
Week 37 Baby – Considered full term – Should be head down • Breech birth happens for 1 in 25 births
Week 38 Baby – 17-20 inches long and 6.25 to 7.5 pounds – Usually born with brown or blue eyes • If the eyes are blue, they may change by the time baby is 9 months old