Implantation-Birth BRENDON DEGNER AND REUBEN MIDDEL.

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