The most important step to begin the reproductive cycle (after intercourse) is fertilization. Fertilization begins when a sperm penetrates an oocyte. Sperm live for about 48 hours and fertilization takes about 24 hours. Only 1% of the sperm in the vaginal canal make it to the uterus. The fusion of the oocyte and sperm nuclei marks the creation of the zygote and the end of fertilization.
1 day post ovulation
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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
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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
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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
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2 comments:
IT IS VERY KNOLAGEBAL & VERY GOOD PHOTOGRAFY
An amazing testimony on on how i conceive, also cure from fibroid, i wonder why people still don't believe that roots and herbs are very essential and fruitful in different aspect, especially when you can't conceive and bear children. I am a living witness because I tried all I could to be pregnant but all to no avail, on this faithful day, i decided to check the net for updates on healthy living and i came across testimonies of lot of women who Elikem Healing Herbal Remedies has helped with her herbs to conceive. i decided to put a try because this has been my greatest problem in life so I emailed {Elikem Healing Remedies} , and she told me what to do which i did, after which he sent me some roots and herbs syrup and gave me step by step guild lines on how and when to have sex with my man. I missed my menstrual flow within a short period of taking it, and the doctor confirmed that I am pregnant. I am very glad to tell the world that I just put to bed a bouncing baby boy last week. Contact Elikem Healing Herbal Remedies for your own testimony on: (elikemremedies@yahoo.com).
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