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Last Menstruation
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Fertilization begins
Fertilization of the ovum to form a new human organism, the human zygote. -
Week 9
The embryo measures 18 mm (3/4 inch) in length.
Fetal heart tone (the sound of the heart beat) can be heard using doppler.
Nipples and hair follicles begin to form.
Location of the elbows and toes are visible.
Spontaneous limb movements may be detected by ultrasound.
All essential organs have at least begun
The vitelline duct normally closes -
wekk 13-16
Sex of child can be deteremined usually 100% accurate -
Week 23
Eyebrows and eyelashes fully developed. -
Week 27
The nervous system develops enough to control some body functions.
The eyelids open and close. -
week 31
The amount of body fat rapidly increases.
Rhythmic breathing movements occur, but lungs are not fully mature. -
Week 40
baby is fully developed and ready for birth
