PregnancyWeeks 1-6

Pregnancy test Home pregnancy test Schedule a appointment for a blood test

with your doctor to confirm 100%

Symptoms Missed period Morning sickness or all day nausea Frequent urination Tiredness Tender breasts Bloating Irritability and mood swings

Fertilization Several million sperm released

Less than 10% make it to cervix 1-2000 enter fallopian tube 1-200 find egg

1 fertilizes the egg – happens in fallopian tube

Sperm releases an enzyme(acrosome) to penetrate egg covering. Inside, it loses tail and the 2 nuclei combine to form the zygote(fertilized egg with 46 chromosomes

Once a sperm enters, the egg hardens and does not allow another sperm to enter

Twins Identical – zygote divides within 2 days Fraternal – 2 eggs are fertilized

Zygote and BlastocystZygote – 0-5 days -when sperm meets egg -1 cell and begins dividing

Blastocyst – 3-7 days - a ball of cells with an inner and outer shell – inner becomes embryo, outer becomes placenta

Embryo and FetusEmbryo – 1-8 weeks – all body parts develop

Fetus – 8 weeks to delivery

Germ Layers of early Embryonic Development

Ectoderm - produces the brain and integumentary system. Also the lining of the mouth, salivary glands, nasal passageways, and anus. Plus the skull, teeth, and endocrine system

Inner layers Mesoderm becomes

the muscular, skeletal, cardiovascular, and lymphatic systems, the kidneys and portions of the urinary tract, the gonads and most of the reproductive tracts and parts of endocrine

Endoderm - most of the digestive system, the exocrine glands, and the liver and pancreas. Most of the respiratory system, and portions of the urinary and reproductive systems (gametes). Portions of the endocrine system

Development Implantation to uterus

1 week after fertilization – baby is size of the head of a pin

Umbilical cord and placenta develop Placenta – organ that connects fetus to womb

for nutrient uptake, waste removal and gas exchange

Umbilical cord – connects fetus to placenta Amniotic sac begins to form

fluid filled sac for protection of developing baby

4 weeks - Spinal cord is developing 200 cells in 3 layers

Endoderm– internal organs Mesoderm – bones, circulatory, kidney,

muscles, reproductive Ectoderm– skin, brain, nerves and hair

About the size of a dime

5 weeks - Eyes beginning to develop Hand and foot plates forming Head much larger than trunk Heart begins to beat

6 weeks - Arm and leg buds forming Heart and liver developing Brain activity can be monitored Oral and nasal cavities beginning to

develop

6 weeks - Mom May have increased sensitivity to smell More serious morning sickness

Get lots of rest Eat regularly Grapes Keep food by bed for am

Weight gain Headaches

Health and nutrition Begin taking prenatal vitamins Drink lots of water Keep a healthy diet Avoid alcohol, tobacco and caffeine Medication – pain relievers and cough

medicine Painting Cat litter