Prenatal Development (before birth)

Prenatal Development The process of growth and development within the womb, in which a single-cell zygote (the cell formed by the combination of a sperm and an egg) becomes an embryo, a fetus, and then a baby.

Conception AKA: fertilization When the ovum and sperm unite Occurs in the fallopian tube 2-3 days after egg is released

Make Room For Baby, Interactive Click on image for video

Human Gestation weeks 266 days from conception Trimesters – Each 3-Month Period of Pregnancy: 1 st Trimester – Months 1,2,3 2 nd Trimester – Months 4,5,6 3 rd Trimester – Months 7,8,9

Zygote The 1 st Stage of Development (The Germinal Stage)

Zygote The unborn for the first 2 weeks; size of a pinhead Travels down fallopian tube & attaches to uterus (implantation)

Museum of Science & Industry A collection of 24 human embryos and fetuses 28 days to 38 weeks Originally donated to the Museum in 1939 Collected in the1930s by Dr. Helen Button All failed to survive because of accidents or natural causes Dr. Button obtained the parents’ permission to use these specimens as teaching tools.

Embryo The 2 nd Stage of Development

Embryo The unborn from weeks 3-8 By the end of the 8 th week, all organs are present

Changes During Embryo Stage Amniotic Sac forms & fills with fluid Placenta develops Umbilical Cord develops

Amniotic Sac Forms around the embryo & fills with amniotic fluid

Amniotic Fluid Protects and cushions the unborn Water, urine, skin cells Clear to light yellow

Placenta Develops Rich in blood vessels; Provides food and oxygen Attached to the uterus

Umbilical Cord Connects the embryo to the placenta Food and oxygen travel in Waste travels out

Fetus The 3 rd Stage of Development

The Fetal Stage - Fetus The unborn from the 8 th week until birth Gains weight and acquires disease-fighting immunities

Quickening 4 th -5 th Month - Movements of the fetus can be felt by the mother

Fetal Position Fetus curls up because there is no more room to stretch out

Lightening 9 th month - Fetus shifts down toward the birth canal The mother feels more comfortable in the upper abdomen

Miscarriage The developing embryo or fetus dies before 20 weeks of pregnancy As many as 15% of all recognized pregnancies end in miscarriage

Stillbirth The developing fetus dies after 20 weeks of pregnancy About 2% of all pregnancies end in a stillbirth

How Big is the Baby Week by Week Size comparison Click on image for link

Development Week by Week Video Clips Weeks 1-9 Weeks Weeks Weeks Weeks Labor and Birth

Prenatal Assignment: Prenatal Development Posters Criteria Point s Size of baby (length, weight & comparison)3 At least 5 facts about the baby’s development5 At least 5 facts about the physical changes of the mother 5 At least 3 relevant graphics/pictures3 Total Points16 Directions: Individually, you will be assigned a developmental month. You are to research information and then create an 8 ½”x11” informational poster for that month. Do NOT copy and paste; produce your own work. Choose facts that would be most useful to a newly pregnant woman to help her understand the physical changes she will be experiencing, as well as how her baby is developing. You must include the following: