Ch 4 – PregnancyChild Growth and Development

Where the Baby is Formed

Conception Every 28 days, an ovum is released by

one of the woman’s two ovaries.

Uterus is pear shaped, able to expand during pregnancy.

Conception During ovulation, inner lining of the

uterus grows and thickens. If the egg is not fertilized, the lining breaks and passes though.

Ovum travels through the fallopian tube to the uterus. Takes about 2-3 days.

Conception When the ovum reaches the uterus,

usually it breaks up and leaves the body.

When the sperm reaches the fallopian tube it may penetrate and fertilize the ovum. This process is known as conception.

Conception Ovum can live 12-24 hours

Sperm can live 48-72 hours

Ectopic pregnancy is when the baby starts to grow in the fallopian tubes instead of the uterus. Dangerous for the mother and does not

end with a live birth.

Role of Genetics Inherit physical traits, talents, and abilities

from parents.

At conception babies get 46 chromosomes. Each chromosome has hundreds of

genes.

Only identical twins have the same DNA

Dominant and Recessive Genes Dominant gene is the “stronger” one. Recessive gene is the “weaker” one.

Only expressed when it is received from both parents.

XX girl XY boy.

Multiple Pregnancy When two or more babies develop in the

same pregnancy Twins are the most common Occur in 3% of pregnancies

Multiple Pregnancy http://

pregnancy.healthguru.com/video/multiple-births-twins-triplets-and-more

Multiple Pregnancy Fraternal children develop from two or

more ova and have a different genetic makeup most common each baby has own chorion

Identical children develop from same ova and sperm and have the same genetic makeup

Mixed types of pregnancy must include fraternal and identical babies

4.1 Vocab Ovum Infertility Uterus Surrogate Fallopian tube Prenatal Development Sperm Zygote Conception Embryo Chromosome Amniotic fluid Gene Placenta Genome Umbilical cord DNA fetus

Prenatal Development Prenatal development takes place

between conception and birth There are 3 stages in prenatal

development germinal stage embryonic stage fetal stage

Germinal Stage (Zygote) The first stage of development From conception to 2 weeks

Zygote forms Implantation of egg occurs (at 10 days)

Zygote

Embryonic Stage (Embryo) Embryonic stage is the second stage of

development, lasts about six weeks most crucial to development baby is called an embryo development of most body systems heart begins to beat cartilage is present before bones form substances pass from mother’s placenta

through the umbilical cord

Embryo

Fetal Stage (Fetus) Fetal stage is the third stage of

pregnancy, lasts from about nine weeks after conception until birth bone starts to replace cartilage baby is known as a fetus all parts of the body mature overall size increases quickly hear heartbeat in the third month quickening (when the fetus moves)

begins between the fourth and fifth months

Fetus

Reverse Conception Calendar http://www.babymed.com/conception-

calculator

Fetal Stage Cont. Age of viability is the age at which a

baby could survive if born, 28 weeks still need extensive medical care better chance of survival each week the

baby is not born During last two months of pregnancy,

inner layer of lungs produces substance that allows for breathing air

receives immunities from mother in the ninth month

Month-by-Month Posters Nine groups – 1 group for each month of

pregnancy Must include:

an overall description of what occurs during that month

At least five facts At least 3 pictures Must be neat and professional. Take your

time and make it look good! You will be presenting these.

Problems in Prenatal Development

Losing a Baby• When baby passes away prior to the 20th

week of pregnancy it is called a miscarriage.– 15% of pregnancies

• After the 20th week it is called a stillbirth. – 2% of pregnancies

• Grief is similar to the loss of an already born child.

Birth Defects There are hundreds of birth defect

types.

Can be physical or mental

Birth defect can result in body structure abnormalities or cause a body part to malfunction, as with blindness, deafness, or mental retardation.

Birth DefectsCan be caused by

environmental factors hereditary errors in chromosomes combination of environmental and

hereditary factors Think:

What environmental factors do you know?

Birth Defects Do’s and Don’ts or Pregnancy Poster

Environmental Hazards Wordle

Birth Defects

Cerebral Palsy – varying problems in the motor system Caused by damage to the brain before, during, or shortly after

birth

Birth Defects Cleft Lip and Cleft Lip Palate – gap in the upper lip or palate

that causes problems with eating, swallowing, speech, and appearance. Caused by hereditary, environmental factors, or both.

Birth Defects Cystic fibrosis – affects respiratory and digestive systems.

Many die before adulthood, although treatment now allows sufferers to live longer. Caused by inheriting defective recessive genes from both parents.

Birth Defects Down Syndrome – a group of problems that may include

mental retardation; heart, blood, and digestive system difficulties; and poor muscle tone. Caused by presence of an extra chromosome 21.

Birth Defects

Muscular Dystrophy – Involve progressive weakness and shrinking of muscles. Caused by mostly heredity.

Birth Defects PKU – condition in which the body is unable to process and

use a specific protein present in nearly all foods. Brain damage and mental retardation can result. Caused by defective recessive genes inherited from both parents.

Birth Defects Sickle Cell Anemia – malformed red blood cells interfere with

the supply of oxygen to all parts of the body. Symptoms include tiredness, lack of appetite, and pain. Can lead to early death. Caused by defective recessive genes inherited from both parents.

Birth Defects Spina Bifida and Hydrocephalus – An incompletely formed

spinal cord may lead to stiff joints, partial paralysis, and problems with the kidneys and urinary tract. 70% of children with spina bifida also have hydrocephalus, in which excess of fluid surrounds the brain Caused by combination of heredity and environmental factors.

Birth Defects Tay-Sachs Disease – Body is unable to process and use certain

fats because of lack of a specific chemical in the baby’s blood. Leads to severe brain damage and death, usually by the age of 4. Caused by defective recessive genes inherited from both parents.

Avoiding Dangers to the Baby A fetus needs to be protected from

many dangers. These include the mother drinking

alcohol or taking other drugs, environmental hazards, diseases, and infections.

Health Hazards to Avoid During Pregnancy

Diseases or illnesses in the mother Drugs

recreational and prescription Radiation exposure

medical X-rays should be avoided Environmental pollution

lead, chemicals, pesticides, herbicides

Diseases and Infections An infection in a pregnant woman can pose a risk for the unborn

baby. Some infections include:

Rubella- can cause blindness, deafness, heart disease, and mental retardation

Toxoplasmosis- can cause blindness, hearing loss, and learning disabilities or cause a miscarriage or still birth

Chicken Pox- fetus can contract congenital varicella syndrome (scarring of skin, eye problems, limb defects)

STIs – can be past on to the infant (like AIDS)Syphilis – skin rash, bone or facial deformities, deafness, brain

damageGenital Herpes- can cause brain infection or mental retardation

Drugs to Avoid during Pregnancy

Medications Prescribed – in 1950 thalidomide was prescribe to relieve

morning sickness. The medication caused more than 5,000 babies to be norm with birth defects such as missing limbs

over-the-counter – antacid can harm the fetus dietary supplements – large amounts of caffeine can harm the

fetus herbal products

Alcohol fetal alcohol syndrome (FAS)

Nicotine – can cause low birth weight, smaller babies, premature birth, and is linked to respiratory infections and allergies

Drugs to Avoid During Pregnancy Illegal drugs – drug addicted babies; cocaine

increase the risk of miscarriage, still birth, premature birth, stroke in fetus, low birth weight, and higher risk of SIDS

SIDS (Sudden Infant Death Syndrome) The sudden, unexpected death of a baby under the

age of one with no clear cause.

Marijuana and methamphetamine use are also linked to low birth weight and premature delivery. Can cause breathing difficulties, poor attention span, drowsiness, or heart defects in children.

Drugs to Avoid during Pregnancy

FASIn what ways do the Fetal Alcohol Syndrome baby and Drug Addicted baby act and look different from a normal baby?

After seeing the effects of FAS, what would you do if you saw a pregnant woman drinking? http://www.youtube.com/watch?v=X9ap3Iimimk http://www.youtube.com/watch?v=31M_GDVYLe0&featur

e=related (3:03)

Environment Hazards X-Rays – can cause birth defects (dental x-rays are

considered safe) Paint - Pesticides LeadCarbon Monoxide Mercury Solvents, paint thinners, and formaldehyde