life span development notes-chapter 3

7/29/2019 Life Span Development Notes-Chapter 3

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DevelopmentalPsychology

Chapter 3


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1. Prenatal Development

iological Beginnings

The Germinal Period 0-2 weeks after conception

Creation of fertilized egg (ZYGOTE)

Cell division

Attachment of the zygote to the uterine wall

Blastocyst:group of cells which consists of an inner mass of cells that will eventuallydevelop into embryo

Trophoblast: outer layer of cells that later provides nutrition and support for the embryoImplantation:attachment of the zygote to the uterine wall takes 11-15 days afterconception

Embryonic Period2-8 weeks after conception

Rate of cell differentiation intensifiesSupport systems for cells form

Organs appear

Blastocystattaches to the uterine wallMass of cells now called an embryoEmbryos endoderm: inner layer, develop internal body parts (digestive and respiratory

system)

Embryos mesoderm: middle layer, become circulatory system, produces parts that

surround the internal areas

Embryos ectoderm: outermost layer, nervous system, brain, sensory receptor, skin parts

Amnion:bag/envelope and contains a clear fluid, provides environment and is shockproof

Umbilical cord:contains 2 arteries and 1 vein, connects baby to placentaPlacenta:disk-shaped tissues in which small blood vessels from the mother and offspringintertwine but do not join

Organogenesis:process of organ formation during the first two months of prenataldevelopment

Fetal Period (p84)Lasts 7 months (2 months after conception-birth)

-Germinal and Embryonic periods occur in first trimester

-Fetal period begins towards the end of first trimester and continues till third trimester


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Course of Prenatal Development


The BrainWhen babies are born, they have approx 100 billion neurons

During prenatal development, neurons spend time moving to the right locations

Neural tube is developed out of the ectoderm

Two birth defects are related to a failure of the neural tube to close are:

-Anencephaly: death

-Spina Bifida: causes paralysis of the lower limbs


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Teratology and Hazards to Prenatal

Development


Teratology:-Field of study that investigates the causes of birth defect

General Principles

Teratogen:any agent that can potential cause a bigger defect or negatively alter cognitiveand behavioral outcomes

- 1 or 2 months before conception or during the period of pregnancy (paternal exposure

to harmful agents can effect)

Depending on the time of the organs being formed, the exposure to teratogen at the

period will affect the specific organs

Alcohol, drugs, hormones, cigarettes, German measles and lead mercury can directly

affect the placenta.

Radiation directly affects the fetus

Influential Factors

1. Dose: greater the dose of an agent, the greater the effect

2. Genetic susceptibility: caused by teratogen linked to the genotype of pregnant woman

and genotype of the embryo or fetus

-Male fetuses are far more likely to be affected by teratogens than female fetuses

3. Time of exposure: damage during the germinal period may even prevent implantation.

In general, the embryonic period is more vulnerable than the fetal period.

-After organogenesis is complete, teratogens are less likely to cause anatomy defects

-Exposure during the fetal period is more likely instead to stunt growht or to create

problems in the way organs function.

Prescription and Nonprescription Drugs-Women who redeemed prescriptions for more than one type of SSRIs early in pregnancy

had an increased risk of heart defects

-Prescriptive: Antibiotics, depressants, certain hormones, accutane (acne pills)

-Nonprescription drugs are like diet pills and high dosages of aspirin


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DevelopmentPsychoactive Drugs1. Caffeine

- Increased risk of miscarriage

2. Alcohol

- Fetal alcohol spectrum disorders (FASD)

- Facial deformities, defective limbs, below average intelligence, impaired memory

development

- FASgrowth delay, cranio-facial anomalies, cleft lip or palate, central nervous system

impairment (if two of the characteristics are present, they are said to have it)

3. Nicotine

- Preterm births and low birth weights, death respiratory problems, attention deficit

hyperactivity disorder- Abnormal growth of placenta and risk of placental complication which decreases

transfer of nutrients to the fetus

- Ectopic Pregnancy: zygote is implanted on fallopian tube rather than in uterus

- Increase Sudden Infant Death Syndrome (SIDS)

- Mothers who are exposed to second hand smokers give birth to babies who have low

birth weight than if they are the smoker themselves

4. Cocaine

- Reduced birth weight, length and head circumference- less effective self-regulation, higher excitability, lower quality of reflexes at 1 month of

age, deficits in behavioral self regulation, impaired language development

5. Methamphetamine

- High infant mortality, low birth weight, developmental and behavioral problems,

memory deficits

6. Marijuana

- Lower intelligence in children

7. Heroin

- Withdrawal symptoms, tremors, abnormal crying, impaired motor control

Incompatible Blood TypesRh-factor: Rh-positive blood

- If pregnant woman is Rh-negative and her partner is Rh-positive, the fetus may be Rh-

positive.

- If fetus is Rh-positive and mother is Rh-negative, the mothers immune system may

produce antibodies that will attack the fetus- But the first Rh-positive baby of an Rh-negative mother is not at risk, only the

subsequent


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Development


Environmental Hazards-X-ray radiation can affect the developing embryo or fetus during first several weeks after

conception, but if there is lead apron protection at the abdomen area, then its fine

-Environmental pollutants and toxic wastes are the sources of danger to unborn children

-Chemicals

-Heat

Maternal Diseases-Rubella (Germna measles)cause prenatal defects

-Syphilis ->eye lesions, blindness, skin lesions

-Genital Herpesnewborns can contract this virus

-HIVinfected baby-Mothers emotional states

-Stress

-Maternal diabetes

-Maternal age

Other Parental Factors-Maternal diet and nutritionis very important for the development of embryo or fetus-But obesity during pregnancy is linked to increased maternal risks of infertility,

hypertensive disorders, diabetes, and delivery by cesarean section

-Maternal Age:adolescences and 35+ years old risks the child to have Down Syndrome(distinct facial characteristics, short limbs, retardation of motor and mental abilities)-More likely to give premature and low body weight babies

-Higher mortality rates

-Due to many reasons (refer to professors slides)-Sometimes it does not need to be chronological age, but it can be biological and

psychological age

-Underweight mothers can lead to an increase of the baby having down syndrome

-Emotional States and Stress:pregnancy women with high levels of stress are atincreased risk for having a child with emotional or cognitive problems, attention deficit

hyperactivity disorder and language delay

-Parental Factor:Mens sperms can also be affected by radiation, petrochemicals etc.


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2. Birth


Stage 1:-Uterine contractions (15-20 minutes at beginning which lasts up to 1 minute each)

-As first stage progresses, contractions become closer

-Contraction causes the cervix of dilate and mothers pelvis bones to become more

flexible

Stage 2:-babys head starts to move through the cervix and the birth canal

-Lasts on average 1.5 hours

Stage 3:-Afterbirth; placenta, umbilical cord and other membranes detached and expelled

Childbirth Setting and Attendants:-Midwives-Doulas (caregiver who provides continuous physical, emotional, and educational supportfor the mother before, during , and after childbirth

Methods of Childbirth

Medications:-Analgesia: relieve pain (tranquilizers)

-Anesthesia: used late first-stage labor and delivery, regional pain-Epidural block: regional anesthesia (bottom half body)

-Oxytocin: synthetic hormone that is used to stimulate contractions

Effects of Pain Medications on Baby (check professors slides)

Assisted Vaginal Delivery-Vacuum-assisted birth

-Forceps-assiscted birth

Natural and Prepared Childbirth:-Natural Childbirth: method attempts to reduce the mothers pain by decreasing her fear

through education about childbirth and relaxation technique during delivery

-Prepared Childbirth: developed by French obstetrician Ferdinard Lamaze includes

special breathing technique to control pushing in the final stages of labor and more

detailed anatomy and physiology course

Cesarean Delivery:-If the baby is in a BREECH position (buttocks going first)

-Refer to professors slides to see when C-section is necessary


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Assessing the Newborn


Apgar Scale-Used 1-5 minutes after birth

-Evaluates: infants heart rate, respiratory effort, muscle tone, body color, and reflex

irritability

-Good at assessing the newborns ability to respond to the stress of delivery and newenvironment

-Scale of 1-10 (10 being best condition)

Brazelton Neonatal Behavioral Assessment Scale (NBAS)-24-36 hours after birth

-Assesses the newborns neurological development, reflexes, and reactions to people and

objects

Neonatal Intensive Care Unit Network Neurobehavioral Scale (NNNS)-Assessment of newborns behavior, neurological, and stress responses and regulatorycapacities

-Useful for evaluating preterm infants and substance-exposed infants

Preterm & Low Birth Weight InfantsPreterm & Small for Date Infants

-Low birth weight infants weight less than 5.5 pounds and can go to 2 pounds-Preterm infants are those born three weeks or more before pregnancy has reached itsfull term

-Small for date infants those whose birth weight is below normal when the length ofpregnancy is considered, they can be preterm or full term

-Child born low in birth weights are more likely to develop learning disability, ADHD,

breathing problems like asthma

-Kangaroo care can be given to help. It is a skin-to-skin contact of baby and parents. Aspreterm infants often have difficulty coordinating their breathing and heart rate, this close

physical contact will help to stabilize the preterm infant heartbeat, temperature and

breathing

-They also show to gain more weight

-Women who engage in heavy leisure time physical activities have less risk of preterm

delivery

-Yoga is positively linked to pregnancy outcomes

-There is no differences in developed and developing countries adolescents who give

birth when their bodies have not fully matured as they will be equally likely to risk having

low birth weight babies


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3. Postpartum Period


Physical Adjustments-Period after childbirth that lasts for 6 weeks till the mothers body is completed adjusted

-The fatigue that the mother feels can undermine the new mothers sense of well-being

and confidence in her ability to cope with a new baby and a new family life

-Concern is the loss of sleep-Hormone production drastically change because when placenta is delivered, estrogen

and progesterone levels drop steeply and remain low till the ovaries start producing

hormones again

-Involutionis the process by which the uterus returns to its prepregnant size 5-6 weeksafter birth

Emotional and Psychological Adjustments-Postpartum depression: major depressive episode that typically occurs about 4 weeks

after delivery-May make interactions difficult with infant as mother is less sensitive and less responsive

to infants

Bonding-parent-infant relationship is very important as it is a foundation for optimmal development

in years to come

-It is NOT TRUE that newborns must have close contact with the mother in the first few

days of life to develop optimally!!

life span development notes-chapter 3

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