Post on 23-Dec-2015
Implantation-Birth BRENDON DEGNER AND REUBEN MIDDEL
First trimester
Starts with implantation
The first 12 weeks of pregnancy.
The embryotic stage occurs within this time
It ends just after the baby begins fetal development
The baby is roughly 9cm and 60g at this point.
Implantation
Implantation occurs when the fertilized egg “zygote” is embedded in the uterus.
Occurs 6-10 days after ovulation
After fertilization the zygote remains within the fallopian tube for 3 days until it is implanted within the uterus.
Embryotic period (first-fifth week)
The embryotic stage occurs from fertilization until roughly 8th week.
fertilization (first day)
implantation (first week)
Central nervous system begins to develop (third week)
Heart is almost fully developed beating begins (third week)
upper limbs develop (fourth week)
Brain and spinal cord structure is developed (fifth week)
The baby is still tiny roughly once centimeter in length and weight less than a gram
Embryotic period (6-8th)
Hands and feet can be seen (8th week)
Becomes reactive to external stimuli (8th week)
Testes within a male become active. (8th week)
No change in female sex development (8th week)
Fetal period (9-12)
Fetal stage begins (week 9)
Placenta is well established at this point (week 12)
Very little is developed within weeks 9-12
Effects on the mother (first trimester)
Pregnancy hormones are released
The developing baby can be seen with ultrasounds
Routine ultrasounds are common
Breasts will begin to produce milk
Symptoms Flatulence
Cramping
Constipation
Heartburn
Fatigue
Second trimester (fetal period)
14th-20th week
Makes up the first part of the Fetal period
The brain is developed so the body can undergo basic functions (14th-16th week) Move
Swallow
Heart beat noticeable
The sex of the Baby is distinguishable (week 16)
Hair begins to grow (20th week)
By the 20th week the baby is roughly 20cm and 300g
Effects on the mother
Appetite increases
Breast tenderness subsides
Movement of the baby can become noticeable
Baby grows within the womb
A “baby bump” can be seen
Stomach gets sore due to stretching
Frequent voiding of the bladder
Gums are sensitive
Third trimester (fetal period)
28th-birth, makes up the last of the fetal stage
It has all body functions developed (28th week)
Organs are still developing (lungs especially)
Skin becomes red and wrinkly (32nd week)
The baby's head is turned down. (32nd week)
Finger nails grow (36th week)
At birth the baby is roughly 51cm and 2.4kg (this number varies greatly) (40th week)
Effects on the mother
The baby begins to kick
Lower back pain
Swollen legs, feet and ankles
Lactation can occur
Stretch marks may occur
Heartburn
Interrupted sleep
PG 534
Works sited
http://www.babyyourbaby.org/pregnancy/during-pregnancy/third-trimester-changes.php
http://www.embryology.ch/anglais/jfetalperiod/entwicklung01.html
http://www.hopkinsmedicine.org/healthlibrary/conditions/pregnancy_and_childbirth/second_trimester_85,P01234/
http://psychology.about.com/od/developmentalpsychology/a/prenataldevelop.htm
http://en.wikipedia.org/wiki/Carnegie_stages
Ritter, Bob, Douglas Fraser, K. L. Burley, and Bob Ritter. Nelson Biology, Alberta 20-30. Toronto: Thomson Nelson, 2008