TimelineUsually a 40 week system
Can also be a 38 week system with week 1 being the 3rd week of the 40 week system
Broken into 3 trimestersWeek 15 Week 28-29Week 40
Week 3The baby is created!!!
Fertilization of the egg
Implantation
In a 38 week system, this is week 1.
Week 5Length = 0.1 in
Brain, spinal cord, heart begin to develop
Gastrointestinal tract begins to develop
Week 6Length = 0.2-0.3 in
Tissue for vertebrae forms
Heart beat is regular and blood flows
Brain develops into 5 areas
Arms and legs begin to develop
Week 10Length = 1.2 in
Pregnancy detectable by exam
Head looks human
Eyelids are developed
Ear begins to form externally
Week 12Length = 2.4 inWeight = 0.5 oz
Form recognizable as human
Responds to stimulation
Fingernails begin to develop
Week 14Length = 3.4 inWeight = 1.6 oz
Essential organs formed
Circulatory system works
Sex is distinguishable
Fist can be made
Week 16CONGRATULATIONS - its your 2nd trimester
Length = 4.7 inWeight = 3.9 oz
Mother shows
Skeleton can be seen in x-ray
Toe-nails develop
Week 20HALF WAY DONE!!!
Length = 6.3 inWeight = 11.3 oz
Vernix caseosa covers skin (white sticky substance)
Quickening can be felt by mother
Week 24HUGE WEEK!!!!
Length = 8.3 inWeight = 1.4 lbs
survive outside womb POSSIBLE with helpWould need medical help for extended period
Week 26Length = 9.1 inWeight = 1.8 lbs
Eyes developed
Startle reflex
Foot and finger prints develop
Air sacs form in lungs
Week 28ENORMOUS WEEK!!!!
Length = 9.8 inWeight = 2.2 lbs
Survival outside womb PROBABLE with medical help
Week 30BEGIN 3rd TRIMESTER
Length = 10.6 inWeight = 2.9 lbs
Eyes open again
Storage of minerals beginsIron, Calcium, Phosphorous
Week 40Length = 14.2 inches crown to rump
20 inches head to toeWeight = 7.5 lbs
BABY IS DUE!!!!
Baby can come up to 2 weeks lateUsually a c-section is scheduled after 2 weeks
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