See all in Pregnancy. See all in Preschooler. See all in Life as a Parent. See all in Video. You might also like You might also like. When will I know if I'm having twins? Telling your employer you're pregnant. Pregnant with twins: eating well. Twins fetal development - 8 weeks pregnant. Twins fetal development - 4 weeks pregnant. Get the BabyCentre app. Brazil Canada Germany India. Connect with us. This Internet site provides information of a general nature and is designed for educational purposes only.
If you have any concerns about your own health or the health of your child, you should always consult with a doctor or other healthcare professional. All of their bones are formed but still soft. They're practicing breathing rhythmically, moving the amniotic fluid in and out of their lungs to help them develop.
They can open and close their eyes, and 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. At the same time, they're shedding the fine hair covering their bodies.
Control of their body temperature is one of the very last things to develop, but they're getting better at it, thanks to their brain development. While their skulls will remain soft allowing for an easier delivery , their other bones are hardening. The average gestational age for twins at birth is 36 weeks.
Their lungs are well developed by 34 weeks, and all body systems are now functioning. They spend their last few weeks building fat layers and putting on weight and shedding most of their body hair.
The vernix that waxy coating on their skin thickens, and body fat increases. BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. When creating and updating content, we rely on credible sources: respected health organizations, professional groups of doctors and other experts, and published studies in peer-reviewed journals. We believe you should always know the source of the information you're seeing.
Learn more about our editorial and medical review policies. How your fetus grows during pregnancy. American College of Obstetricians and Gynecologists. Multiple pregnancy. Cleveland Clinic. Fetal development: Stage of growth. Hiersch L et al. Differences in fetal growth patterns between twins and singletons. National Library of Medicine. Johns Hopkins. Twin pregnancy: Answers from an expert.
Mayo Clinic. Twin pregnancy: What multiples mean for mom. Fetal development. Join now to personalize. Photo credit: Thinkstock. Learn more: Fetal development: What does your baby look like now? Signs you're having twins or multiples Pregnant with twins: premature birth and other complications Twin birth video Likelihood of twins: can you increase your chances?
Sources BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. Related Slideshows. How big is my baby? Week-by-week fruit and veggie comparisons. Fetal development week by week. What to eat when pregnant: The 12 best foods. Age affects the fertility of both men and women, and is the single biggest factor affecting a woman? Androgen deficiency in women and its treatment is controversial, and more research is needed.
IVF in-vitro-fertilization and ICSI intracytoplasmic sperm injection are assisted reproductive treatment ART procedures in which fertilisation of an egg occurs outside the body.
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Home Reproductive system - female. Twins - identical and fraternal. Actions for this page Listen Print. On this page. Multiple births are more common than they were in the past, due to the advancing average age of mothers and the associated rise in assisted reproductive techniques, in particular the use of fertility drugs. Twins account for over 90 per cent of multiple births. There are two types of twins — identical monozygotic and fraternal dizygotic.
To form identical twins, one fertilised egg ovum splits and develops two babies with exactly the same genetic information. This differs from fraternal twins, where two eggs ova are fertilised by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times. Twins are more or less equally likely to be female or male.
Factors that increase the odds of having twins Some women are more likely than others to give birth to twins. The factors that increase the odds include: Advancing age of the mother — women in their 30s and 40s have higher levels of the sex hormone oestrogen than younger women, which means that their ovaries are stimulated to produce more than one egg at a time.
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