1 day post ovulation
http://assets.babycenter.com/i/m/fetal/2.jpg
Cellular division begins and after a few weeks, the embryo elongates and expands the yolk sac.
The division continues and at about 9 weeks, the essential body parts are accounted for and the heart finishes division into four chambers.
9 weeks
http://assets.babycenter.com/i/m/fetal/9.jpg
The first trimester ends at about 12 weeks. During this time, reflexes develop. Nerve cells are multiplying and synapses are forming furiously. At week 14, fetal sexual organs are visible, so you can now concentrate on boy or girl names and buying all sorts of color coordinated expensive baby belongings :)
14 weeks
http://assets.babycenter.com/i/m/fetal/14.jpg
At 20 weeks, bone marrow starts making blood cells and the mother can detect fetal movement.
20 weeks
http://www.babycenter.com/i/m/stages/popups/20/index.jpg
At 22 weeks, hearing is possible and during week 23, sensory brain waves activate the auditory and visual systems and blood vessel development begins in the lungs to prepare for life outside the uterus.
23 weeks
http://assets.babycenter.com/i/m/fetal/23.jpg
At week 26, the lungs are capable of breathing air. Testes in the male also descend into the scrotum.
26 weeks
At 32 weeks, the immune system begins to develop. With the plethora of problems that both an under-active and over-active immune system can cause, this step is particularly important.
32 weeks
http://www.babycenter.com/i/m/stages/popups/32/index.jpg
At 36 weeks, the orienting response is prevalent. Ossification of the bones begins and the leg bone is completely ossified. At the end of this week, a fetus is considered full-term.
36 weeks
http://www.babycenter.com/i/m/stages/ultrasound/ultrasound_36_hg.jpg
At 38 weeks, the organs are fully developed for life outside the womb. Lungs increase production of surfactant to keep alveoli open.
38 weeks
http://www.babycenter.com/i/m/stages/popups/38/index.jpg
At 40 weeks, the fetus is full term and birth is imminent. The fetus has over 300 bones, which will later fuse to the 206 bones of an adult.
http://www.channel4.com/health/microsites/M/miracles_in_the_womb/images/feature1.jpg
2 comments:
IT IS VERY KNOLAGEBAL & VERY GOOD PHOTOGRAFY
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