Supertwins are multiple births of three or more, including triplets, quadruplets, quintuplets, sextuplets, septuplets, and octuplets, born to one woman from a single pregnancy on the same day.
Finding out you're having a baby is one of the most exciting times in your life.
Superfetation occurs when a second fertilized ovum implants in a uterus already containing a pregnancy of at least 1 month (69). Superfetation has been suggested in some cases in which the twins are markedly discordant for birth weight, supposedly due to different gestational ages (69,81).
When more than one ovum is fertilized and implants in the uterus, the result is dizygotic (fraternal) twins, triplets, or other multiples. Although two fetuses develop simultaneously in superfetation, they differ in maturity, having been conceived days or even weeks apart.
In rare cases, fraternal twins can be born from two different fathers in a phenomenon called heteropaternal superfecundation. Although uncommon, rare cases have been documented where a woman is pregnant by two different men at the same time.
But you may be left wondering: Can twins have different fathers? The answer is yes, but only in cases in which they're fraternal, as identical twins form from a single egg/sperm combination and thus cannot have different fathers.
It's such a rare occurrence that medical experts have only been able to identify a few confirmed cases of superfetation in pregnant women. So, while yes, you could get pregnant while you're already pregnant, it's probably not something to worry about.
For the most part, twins and multiples share the same birthday. However, depending on the time of day the babies are born and how long the timespan is between each baby's birth, twins can be born on different days.
Carmen Martinez, in a rare occurrence, gave birth to rare identical twin daughters three days apart. The babies were born are Gabby and Bella. Woman gave birth to rare identical twins in Abilene, Texas. In a rare occurrence, a woman gave birth to rare identical twin daughters three days apart.
One placenta and one amniotic sac.
This is the riskiest and rarest type of twin pregnancy. Fetal complications can arise due to tangling of the umbilical cords or an imbalance in nutrients, blood or other vital life supporting systems.
This is why fraternal twins run in families. However, only women ovulate. So, the mother's genes control this and the fathers don't. This is why having a background of twins in the family matters only if it is on the mother's side.
For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother's genetics, not the father's.
Many people believe twins skip a generation, but that's just a myth. The idea that twins skip generations likely comes from the fact that the genetic factors contributing to twins only come from the gestational parent's side.
Dizygotic twins are the most common type and are known as fraternal twins. Two-thirds of all sets of twins are dizygotic. When two eggs are fertilized during the same pregnancy, the result is a set of dizygotic twins. They are fertilized by two different sperm.
Dizygotic (DZ) twins, also called fraternal twins, occur when two egg cells are each fertilized by a different sperm cell in the same menstrual cycle. DZ twins are about twice as common as MZ twins, and they are much more likely to run in families.
Fraternal twins, also called dizygotic twins, develop when two sperm fertilize two eggs separately — often because a mother has released two eggs at the same time during ovulation.
It's a common misconception that twins skip a generation in families. There is absolutely no evidence, other than circumstantial, that twins are more likely to occur every other generation.
The longest interval between the birth of twins is 90 days, in the case of Molly and Benjamin West, dizygotic (fraternal) twins born in Baltimore, Maryland, USA to parents Lesa and David West (all USA) on 1 January and 30 March 1996.
Is it OK to have sex during pregnancy? Your developing baby is protected by the amniotic fluid in your uterus, as well as by the strong muscles of the uterus itself. Sexual activity won't affect your baby, as long as you don't have complications such as preterm labor or placenta problems.
Most of it will simply be discharged from the body through the vaginal opening. Thanks to the placenta, amniotic sac, and mucus plug covering the cervix, your baby has a protection system that's very specific about what goes in and stays out!
Your partner may be nervous that their semen will reach and hurt the baby during penetrative vaginal sex, but this isn't possible: Your baby is protected by the placenta, the amniotic sac, and the mucus plug. Most semen and sperm that enter a woman's body during sex is discharged the same way it went in.
In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair.
Can twins have two different blood types if they have the same father? Definitely yes if they are fraternal twins. And although much less common, it is also even possible if they are identical twins. In fact, a mom, dad, and twins could all end up with different blood types!
According to The American Society for Reproductive Medicine, women who are fraternal twins have a 1 in 60 chance of having twins, and men who are fraternal twins have a 1 in 125 chance of fathering twins. It was previously believed that identical (monozygotic) twins were random — not genetic.