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Here are some general facts about fetal development in the 1st trimester!
- brain, spinal cord, heart & gastrotintestinal tract begin to form
Week 4 & 5
- arm & leg buds are visible, but not clearly distinguishable
- heart begins beating & steadily increases, reaching its peak at 9 weeks
- placenta begins to form & produce important hormones
- structures that will become the eyes & ears start forming
- blood begins moving through main vessels
- embryo is 1/4" long by the end of week 5
- lungs, jaw, nose, palate begin to form
- hands and feet have webbed structures that'll become toes & fingers
- brain continues forming
- vaginal u/s may detect an audible heartbeat
- embryo is 1/2" long by the end of week 6
- every essential organ has begun forming
- hair & nipple follicles are forming
- eyelids & tongue begin forming
- elbows & toes are more visible as embryo begins to straighten out
- ears continue forming internally & externally
- bones are beginning to form
- muscles are beginning to contract
- facial features continue to mature
- the embryo is 1" long by the end of week 8
- week 9 = embryo becomes a fetus
by the end of week 13:
- genetalia have clearly formed into male or female, but can't yet be clearly seen on u/s
- the eyelids close & won't open again until the 28th week of pregnancy
- the fetus can make a fist
- buds for baby teeth appear
- the head is nearly half the entire size of the fetus
- the fetus is about 3" long & weighs 1oz by the end of week 13
and now for some images!!! the real photos are after the u/s photos - just a warning incase some people feel uncomfortable looking at those photos!
Some of the real pictures are taken when they go in to remove an ectopic pregnancy
This is from an interview with the artist that took most of hte pictures of fetuses:
To be able to show the development of the foetus at all from the very earliest stage, I used macro-lenses and wide-angled special optics, manufactured specially for me by Karl Storz in Germany and Jungners Optiska in Stockholm. And for technical reasons related to photography, I had to use foetuses from what are called extrauterine pregnancies. But I have also shot living foetuses in the womb using an endoscope. These days, I work with ultrasound and three-dimensional pictures taken through the skin from outside the body. It is a tremendously exciting technique, although it still doesn’t reach the same technical quality as my old pictures. But it has allowed me to capture the facial expressions of foetuses, for example, which I couldn’t do before.