3 Prenatal Baby Development Development of the baby during the period before birth.Development in three stagesZygote—first 2 weeks of pregnancyEmbryo—3rd-8th week of developmentFetus—8th week till delivery
4 How is Prenatal Development Measured? Prenatal Period lasts 40 weeksIs measured from the last menstrual periodBroken up into 3 trimestersEach trimester is about 13 weeks, or 3 months
6 Month 1—The Zygote Weeks 1-2 Weeks 3-4 Finishing menstrual cycle Weeks 3-4Fertilization/conceptionEgg travels to uterus (womb)Implantation—this is when pregnancy technically begins
7 The Zygote—Month 1 Cell multiplication begins Internal organs and circulatory system begins to form.At the end of two weeks the zygote is the size of a pin-headHeart begins to beat3 weeks & 1 day after fertilizationSmall bumps show the beginnings of arms and legs
8 Parts of the ZygoteAt 3-4 weeks the brain divides into 3 parts: Forebrain, midbrain, hindbrainYolk sac: A membrane-lined sac that provides nourishment in the early stages of a baby's development in utero. It also acts as a rudimentary circulatory system before the embryo is able to circulate blood internally.
9 4 weeks & 6 days….the skin is transparent because it is only 1 cell thick
10 Conception Once a month and ovum is released Ovum- A female eggThe Egg moves through the Fallopian Tube to the uterusUterus-Where the baby develops during pregnancyIf not fertilized it disintegrates and is flushed away with menstruation
11 But . . .If it is fertilized in the Fallopian Tube by a sperm—Conception occursThis Union is whatwe call a zygote!
12 The Embryo—Month 2 At 5 weeks the embryo is ¼ inch long All major organ systems developFace and limbs take shapeAmniotic sac is inside the placentaAmniotic fluid – guards against jolts, keeps the fetus at a constant temperature, keeps the fetus from forming a connection to the endometrium lining.Amniotic sac – holds the amniotic fluid, a very strong, clear and transparent sbaby to exit out of it.
13 Month 2Webbed fingers and toes develop7 weeks8 weeks
14 The Embryo—Month 2 The placenta and Umbilical Cord develop Placenta- The tissue that connects the sac around the unborn baby to the mother’s uterusUmbilical Cord- Tube that connects the baby to the placentaBrings the baby nourishment and oxygen from the mother’s bloodTakes away waster productsAmniotic SacHolds the amniotic fluid and surrounds the babyAmniotic fluidGaurds against jolts and keeps constant temperatureAmniotic sac is inside the placentaAmniotic fluid – guards against jolts, keeps the fetus at a constant temperature, keeps the fetus from forming a connection to the endometrium lining.Amniotic sac – holds the amniotic fluid, a very strong, clear and transparent sbaby to exit out of it.
16 Month 2This is when signs and symptoms of pregnancy usually become apparentFirst trimester has the worst symptoms
17 Look Up Early Symptoms of Pregnancy Web MD Pregnancy App
18 Signs & Symptoms of Pregnancy 1. Missed menstrual period 2. Fuller and more tender breasts 3. Nausea or morning sickness4. Fatigue5. Sensitivity to particular odors6.Increased urination7. Moodiness
19 The Fetus—Month 3 The fetus is about 1 inch long Nostrils, mouth, lips, teeth buds, and eyelids formEyelids are fused shutArms, legs, fingers, and toes have developedAll internal organs are present—but aren’t ready to function
21 Fingers & toes no longer webbed 12 Weeks11 Weeks
22 The Fetus—Month 3The genital organs can be recognized as male or femaleCan tell as early as 12 weeksMost doctors give the ultrasound at weeks
23 Summary of First Trimester The most critical and greatest time of risk and vulnerability for birth defects depending on what the mother does or does not do during the pregnancy i.e.: taking drugs/medication.Signs and symptoms of pregnancy are more likely to occur.The majority of the physical development occurs (every physical feature and vital organs form, heart beats and brain waves begin etc.)There is small maternal weight gain.
29 The Fetus—Month 4 Fetus is 3 inches long and weights 5 oz. Your baby is covered with a layer of thick, downy hair called lanugo.His heartbeat can be heard clearly.This may be when you feel your baby's first kick.The baby can such thumb, swallow and hiccup.
32 The Fetus—Month 5 The Fetus is about 6 inches long and weighs 4-5 oz. A protective coating called vernix begins to form on baby's skin.Hair eyelashes and eyebrows appearOrgans keep maturingFetus is very activeThe eyes can open and blink
33 Smallest baby in the world born At just 22 weeks Her little feetShe was 10 OUNCES when born and 9.5 inches. That's just longer than the length of your hand. She weighed less than a can of soda!
34 The Fetus—Month 6 The fetus is 8-10 inches long and weighs 4-5 oz. Your baby's lungs are filled with amniotic fluid, and he has started breathing motions.If you talk or sing, he can hear you.Fat is starting to deposit under the skin
38 The Fetus—Month 8 The fetus is 14-16 inches long and weighs 2-3 pounds Layers of fat are piling on.Fetus has probably turned head-down in preparation for birth.Fetus may react to noises with a jerking action
40 The Fetus—Month 9Fetus is about inches long and weighs 5-6 poundsSkin is smooth because of the fatBaby’s movement slows down due to lack of room“Lightening” occurs when the baby drops in the pelvisDisease fighting antibodies are taken from the mother’s blood