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HOW THEY GROW
We asked renowned medical illustrator Peg Gerrity to take us inside the womb to see how fraternal twins develop from the moment of implantation until they're ready to be born.
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Nonidentical twins like these (also known as dizygotic twins) are the. Each baby grows from a separate fertilized egg (zygote). By 3 weeks each zygote has developed into a ball of several hundred cells, called a blastocyst, and is burrowing into the uterine lining.
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The twins are now embryos, made up of two layers of cells from which all the organs and body parts will develop. By next week, each embryo will have its.
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By 8 weeks, your twins already have arms and legs that bend. Their hearts have been beating for two weeks. The nerve cells in their brains are branching out to connect with one another.
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Your twins are busy kicking and stretching. Their hands meet over their hearts and their tiny fingernails are starting to grow in. Eyelids cover their eyes. Tooth buds are sprouting under their gums.
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Your babies have their own unique fingerprints. They can grimace and squint and have started peeing out the amniotic fluid they've been swallowing. You can see their sex organs during an.
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Talk to your twins – they may be able to hear you now. Hair is sprouting on their heads. Their skin has developed a greasy, white coating to protect it photos of baby in womb week by week from its long bath in amniotic fluid.
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Your babies' eyebrows are growing in. Tooth buds for baby and adult teeth are in place and taste buds may be working. Their skin is red and wrinkled now, no matter what color it will be after birth.
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Your twins can open their eyelids, which now sport eyelashes. Layers of fat are building up under their skin, smoothing it out. They can suck their fingers and you may feel them hiccuping.
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Nails now cover your babies' fingers and toes. Their arms, legs, and torsos are filling out. Some babies even have a full head of hair by now. Most twins will be.
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Most twins are. Their lungs are well developed by 34 weeks. They spend their last few weeks building fat layers and putting on weight. The average newborn twin weighs 5 1/2 pounds.
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