Fetal development


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Fetal development

  1. 1. by Karolen Cubilete and Rebecca Merilan Period 7
  2. 2. Your menstrual period has just ended, and your body is getting ready for ovulation. For most women, ovulationtakes place about 11 - 21 days from the first day of the last period. During intercourse, several hundred million sperm are released in the vagina. Sperm will travel through the cervix and into the fallopian tube. If conception takes place, the sperm penetrates an egg and creates a singleset of 46 chromosomes called a zygote, which is the basisfor a new human being. The fertilized egg spends a coupledays traveling through the fallopian tube toward the uterus, dividing into cells ; it is called a morula. The morula becomes a blastocyst and will eventually end up in the uterus. Anywhere from day 6-12 after conception, the blastocyst will imbed into the uterine lining and begin the embryonic stage.
  3. 3. Week 3 - Gestational Age Week 4 & 5 - Gestational Age (Fetal Age - Week 1): (Fetal Age - Weeks 2 & 3): Arm and leg buds are visible,The embryo is going through lots but not clearly distinguishable.of basic growth at this time, with The heart is now beating at athe beginning development of steady rhythm. The placentathe brain, spinal cord, heart, and has begun to form and isgastrointestinal tract. producing some important hormones including hCG. There is movement of rudimentary blood through the main vessels. The early structures that will become the eyes and ears are forming. The embryo is ¼ inch long by the end of these weeks.
  4. 4. Week 7 - Gestational Age (FetalWeek 6 - Gestational Age Age - Week 5):(Fetal Age - Week 4): At 7 weeks gestation, everyThe formation of the essential organ has begun tolungs, jaw, nose, and form in the embryo’s tinypalate begin now. The body even though it stillhand and feet buds weighs less than an aspirin.have webbed structures The hair and nipple folliclesthat will become the are forming, and the eyelidsfingers and toes. The and tongue have begunbrain is continuing to formation. The elbows andform into its complex toes are more visible as theparts. A vaginal trunk begins to straightenultrasound could out.possibly detect anaudible heartbeat atthis time. The embryo isabout a ½ inch inlength.
  5. 5. Week 8 - Gestational Age Weeks 9 thru 13 -(Fetal Age - Week 6): Gestational Age (FetalThe ears are continuing to Age - Weeks 7 thru 11):form externally and The fetus has growninternally. Everything that to about 3 inches inis present in an adult length and weighshuman is now present in about an ounce. Thethe small embryo. The genitalia havebones are beginning to clearly formed intoform, and the muscles can male or female, butcontract. The facial still could not befeatures continue to seen clearly on anmature, and the eyelids are ultrasound. Thenow more developed. The eyelids close andembryo is at the end of the will not reopen untilembryonic period and the 28th week ofbegins the fetal period. pregnancy. TheThe embryo is about 1 fetus can make ainch long and is the size of fist, and the budsa bean. for baby teeth appear. The head is nearly half the size of the entire fetus.
  6. 6. Weeks 14 thru 16 -Gestational Age (Fetal Weeks 17 thru 20 -age - Weeks 12 thru 14): Gestational Age (Fetal Age - Weeks 15 thruThe fetus’s skin is transparentand a fine hair called lanugo 18): The baby has reached a pointbegins to form on the head. where movements are beingThe fetus begins sucking and felt more often by the mom.swallows bits of amniotic fluid. The eyebrows and eyelashesFingerprints which grow in, and tiny nails haveindividualize each human begun to grow on the fingersbeing have now developed on and toes. The skin of thethe tiny fingers of the fetus. fetus is going through manyMeconium is made in the changes and begins tointestinal tract and will build produce vernix at theup to be the babys first bowel twentieth week. Vernix is amovement. Flutters may be white pasty substance thatfelt in the mom’s growing covers the fetus’s skin toabdomen as the fetus begins protect it from amniotic fluid.to move around more. Sweat A fetal heartbeat could beglands have developed, and heard by a stethoscope now.the liver and pancreas produce The fetus has reached afluid secretions. The fetus has length of 8 inches andreached 6 inches in length and weighs about 12 ounces.weighs about 4 ounces.
  7. 7. Weeks 21 thru 23 - Weeks 24 thru 26Gestational Age (Fetal Age - Gestational Age- Weeks 19 thru 21): (Fetal Age - Weeks Lanugo now covers the 22 thru 24)- fetus’s entire body. The Beginning the third fetus is beginning to Iftrimester: delivered your baby was have the look of a now, it could survive with newborn infant as the the assistance of medical skin becomes less technology. The fetus has transparent while fat developed sleeping and begins to develop. All the waking cycles and mom will begin to notice when components of the eyes each of these takes place. are developed. The liver The fetus has a startle and pancreas are working reflex, and the air sacs in hard to develop the lungs have begun formation. The brain will completely. The fetus has be developing rapidly over reached about 10-11 the next few weeks. The inches in length and nervous system has weighs about 1 - 1 ¼ developed enough to pounds. control some functions. The fetus has reached about 14 inches in length and weighs about 2 ¼ pounds.
  8. 8. Weeks 27 thru 32 -Gestational Age (FetalAge - Weeks 25 thru30): fetus really fills outTheover these next fewweeks, storing fat on thebody, reaching about 15-17 inches long and Weeks 33 thru 36 -weighing about 4-4 ½ lbs. Gestational Ageby the 32nd week. Thelungs are not fully mature (Fetal Age - Weeksyet, but some rhythmic 31 thru 34): This is about the time thatbreathing movements are the fetus will descend intooccurring. The bones are the head down positionfully developed but are preparing for birth. Thestill soft and pliable. The fetus is beginning to gainfetus is storing its own weight more rapidly. Thecalcium, iron and lanugo hair will disappearphosphorus. The eyelids from the skin, and it isopen after being closed becoming less red andsince the end of the first wrinkled. The fetus is nowtrimester. 16-19 inches and weighs anywhere from 5 ¾ lbs to 6 ¾ lbs.
  9. 9. Weeks 37 thru 40 - Gestational Age (Fetal Age - Weeks 35 thru 38):At 38 weeks the fetus is considered full term andwill be ready to make its appearance at any time.Mom may notice a decline in fetal movement as thefetus is now filling the uterus with little room tomove. The fingernails have grown long and willneed to be cut soon after birth. Small breast budsare present on both sexes. The mother is supplyingthe fetus with antibodies that will help protectagainst disease. All organs are developed, with thelungs maturing all the way until the day of delivery.The fetus is about 19 - 21 inches in length andweighs anywhere from 6 ¾ lbs to 10 lbs.