are fraternals ALWAYS hereditary?

Ciera - posted on 03/07/2011 ( 26 moms have responded )

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Are fraternals ALWAYS hereditary? I can't seem to find this out! Mine are fraternal but I do not know of ANY fraternals on either mine or my husbands side! I only need to know bc my twins just turned 2 last month and I also have a 7 month old daughter. My husband and I want another baby but not 2 more so that is making us hesitate. If it is not hereditary, then mine were just a fluke and most likely we won't have any more, but if it is hereditary, then that mesans i could very easily have another set. Does anyone know if you can have fraternals even if it is NOT hereditary? and how can you know for sure if you have the gene or not? everything i am finding says that only the gene can cause hyperovulation unless you are using some sort of reproductive assistance medications.

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Kristyn - posted on 03/13/2011

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Identical twins are not heriditary. They cant be - the fact that an egg splits once fertilized has nothing to do with anything. A woman that ovulates two eggs at once however is (fraternal) Its only heriditary on the females side - but that incorporates her fathers family too. For instance sake - if you have frat twins, its to do with your family (ie your mum and dads family) but not your partners family. His sperm has nothing to do with it. The fact that two of his millions of sperm fertilzed two eggs is not a phenomenom lol.

Having said all that - I have two sisters that did not have twins amongst their 5 successful pregnancies. I was older when I concieved which apparently increases the odds aswell. I do know of lots of women that have two sets of frat twins. The chances are increased for sure.

As you wouldnt have given back one of your first set of twins, Im sure you'll cope with two more just as well as one more. Whatever will, will be :0)

Kim - posted on 03/07/2011

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I have been hearing that fraternal twins are hereditary, but just because you don't have any twins in your family doesn't mean that no one ever was pregnant with two. My Ob's told me that it's very common for people to get pregnant with twins and to loose one of them and not even know it. The Ob that delivered me actually had a twin pregnancy and lost one of hers in utero. Or... the women in your family just never got pregnant during a cycle that two eggs ovulated.

Jennifer - posted on 09/15/2012

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No, they are not always hereditary. It had to start somewhere didn't it?

Identical twins are random and occur when a single fertilized ovum splits in half early in the pregnancy. This is never genetic or dominant in any races, it is totally random.,

Fraternal twins, however, are the result of hyperovulation, when both ovaries release an egg during the same cycle, whereas it is usually just one. And beyond having two eggs ready, the both have to end up being fertilized. So the release of two eggs does not always result in twins.

Basically, the genetic part is whether or not hyperovulation runs in your family or not. If it does, it just makes you more likely to have twins (if you've inherited this trait).

However, even if it doesn't, people randomly release two eggs sometimes, at the drop of a hat, regardless of genetics.

Oh... and also if you're older than 35, or even just the older you are your chances are higher. That's because your body is trying to use up its eggs before you hit menopause, so it tends to go a bit haywire at times..

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Charity - posted on 11/13/2013

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No history of twins either and I come from a huge family. My mom had 9 babies. My (moms mom) grandmother 6 and great grandmother 18 live born children and many family members with 5-8 children and no twins. I don't have such a great history on my dads side of the family so there could be twins there and I not know it. No doubt fertile myrtle's run in my family but twins?? not really. I am sure many factors come into play. There are many women who may release more than one egg at ovulation but still be unable to carry all babies to term or even past a few months. If you were able to release two or more eggs I think health, uterine environment and even husbands sperm to get to both eggs come in to play. I guess since I was able to carry twins full term I am more likely than the general population to do so again but, who knows. I find the subject of twins twice interesting and it does happen, crazy!

Telia - posted on 07/29/2013

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I see ur point however it's just the hyper ovulation that is said to be hereditary which doesn't necessarily result in twins even if there r 2 eggs present.

Telia - posted on 07/29/2013

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Nope the opposite... Fraternal are Not hereditary it's all about the mother having 2 fertile eggs ate once and both being fertilized obviously by the sperm... I have fraternal twins , they have to seperate sacks inside ur uterus and the squally dot look alike... Mine are boy/ girl twins... And boy girl twins are also NEVER identical as most don't understand bc I got that question a lot... Think penis/ vagina= not identical parts lol! 2 different eggs and 2 different sperm. Identical twins are "said" to be linked to the fathers side of the family but I'm not sure it has anything to do with his family but
Mainly is just him... His sperm split into 2 ((and sometimes 3/triples)) making them have identical features as the DNA is in the sperm and it is the same DNA just split between 2 babies. They grow in the same egg or sack together in together in the woman's uterus.

Shanna - posted on 04/09/2011

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I am in the same boat as you...My b/g twins are 6 now, and I am 11 weeks pregnant now, and had 2 ultrasounds to confirm it is just one baby...Excited for the new experience.

Katie - posted on 04/08/2011

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not a fluke, a blessing...and not hereditary just 2 eggs. since you've already had twins, your chances of having twins again increase; also chances also increase if you're over 35

Khadijah - posted on 03/17/2011

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All the twins in my family are fraternal. My husband side has one set of identical twins, but my side has 4 sets of fraternal!!

Tracy - posted on 03/16/2011

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I heard a geneticist speak about this at a conference for multiple birth parents. Yes fraternal twins are hereditary (with the exception of fertility treatment of course!). As others have said it is caused by the woman producing more than one egg, so it is her genes that count. Some claim that identical twins could be hereditary too. Even though there is no scientific evidence of this, if you trace ones genealogy there are often many cases of identical twins in the same family.

Jacqui - posted on 03/15/2011

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hi my granny had two sets of twins one girls and one boys she had 8 children ,her daughter ( one of the twins) had a set of boy twins (she had 12 children) and i had a set of twin boys(im the ony one to have twins out of 48 grandchildren) the doctors told me its the female gene dat carrys twins and going by my family it seems right and i was 30 wen i had my twins and if i went again id have a higher chance of having another set of twins ..the twin gene didnt skip a generation in my family it just seems to pick one person out of each generation and i was the lucky one ...lol

Laura - posted on 03/15/2011

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I was pregnant with twins with my first daughter, but had vanishing twin syndrome. Then, 12 years later had fraternal twins. But, I also know plenty of people who only had one set of twins. I really think it is a roll of the dice.

Tracy - posted on 03/14/2011

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twins had to start somewhere and when they did,they weren't herditary. It depends on your fertility. I have been told the older you get the more fertile you are. Who knows?? I got pregnant with my twins when I was 31 going on 32. I was told growing up that we didn't have twins on either side of the family.What happend was, when I was younger I had found out my cousins father is an identical twin. She had told me I wouldn't have twins,only she would have a chance or her children. Turns out my parents have twins in their family on both sides! I had 6 single births and then my last pregnancy was twins. So, I really believe it depends on your fertility. Because chances are,twins didn't always exist in my family.I am the only one out of my parents 4 children that had twins.And your chances to have multiples again increase when you have had them before. However, don't hesitate to have more. If you have another set it will only mean you got blessed twice again! But there are no guarantees either way. My twins are fraternal. And to be honest,I want another boy so my son is not the only boy. But I am scared to death to have another set of twins myself. You have three,you may feel like your over flowing right now, but to be honest 5 is nothing compared to 19. To me that is overflowing b/c I haven't reached that point. Eight is a lot. But once you get to that number you never imagined you'd get to,you look at it from a different perspective. I just don't think I could handle another set of twins. I know my husband said he couldn't! And my cousin? she never had twins.

Rebecca - posted on 03/12/2011

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Tristen... Identicals are from when 1 sperm fertilizes 1 egg and then spontaneously splits. if it were 2 sperm then the embryo would not be able to survive, defective chromosomes.

Crystal - posted on 03/11/2011

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its not the fraternals or identical that is hereditary its just the twins that are hereditary and the doctors say once you have one set of twins your at a greater chance of having multiples but that dose not mean its going to happen for sure .twins run on my husbans side his mom is an identical twin but we had faternal twins and now we are having alil girl and the boyz are now a year old and we also have a 4 year old lil girl

Michelle - posted on 03/11/2011

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I have fraternal boys with no history of twins in our families...BUT, I must have the ability to ovulate two eggs to get fraternals.....so even though there is no history, there would be every chance that I would get twins again....

[deleted account]

I have 15 month old ID Boys. The older you get the more likely you are to have franternal twins. After age 35 your "clock" tells the body to drop more eggs. Also, if you've already had twins your chances of having a second set are much higher.

Tristin - posted on 03/11/2011

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I am a twin and I have g/b twins. I am identical. I miscarried twins naturally. And after a long struggle had to go IVF. We learned alot through our 'science project' (we use to call our miracles that!! Twins are just mostly random!!! The hereditary part plays a bit on the mother's side, but again it's just basically what happens when the the mother releases her eggs. Many women release many eggs per month. Sperm usually fertilizes one egg. At the time of an egg getting fertilized a protective barrier goes around the egg to protect from other sperm entering. Although, multiple eggs can get fertilized at the same time thus creating multiples! If more than 1 sperm enters an egg at the same time then this creates identical twins. Usually, this will happen days 2-4 after conception!

Celeste - posted on 03/11/2011

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Ditto to what everyone else posted. Fraternal twins can be hereditary but not every case is due to genes. My mother's side has no fraternal twins but I have a set of fraternal twin boys.

However, I know that once you do have a set of fraternal twins, you do have a higher chance of having another set of fraternals than those who don't have twins..

Amanda - posted on 03/11/2011

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I have b/g twins with no family history. That first u/s was a complete shock! My OB said twins are more likely in women in the 30s due to elevated follicle stimulating hormone (FSH). I was 32. She also said if you've had one set of fraternals, your chance of another set is like 1 in 5. She said some women just drop two eggs more often. I'd like one more baby, but yeah, another set of twins would be really difficult, especially because I'm not getting any younger. So yeah, I hear ya.

[deleted account]

Fraternal twins are only hereditary and only on the females side. The male just chooses the sex in the case of twins. Identical are where the sperm splits but they do not know why. Twins even if very distant and you were not aware of them, the gene is still there. A lot of the time, twins, 1 dies right off the start so a woman may not even been aware she was infact pregnant with twins.

CHERYL - posted on 03/09/2011

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hi ive heard that frat twins are herefitary but only from the female side the males just determain the sex of the baby. but they gotta start somewhere. i also heard if its hapened once it can happen again i wouldnt let it put me off if u really want another baby.

Sally - posted on 03/08/2011

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I had fraternal b/g twins and there had been no history of twins in my family! I believe it is only ever the mother's line that is responsible due to it being two eggs released (at least this is what I was told and makes sense)!

I do have a friend who went for an early scan and was told she was having twins and then went for a scan at 12 wks and there was only one baby (vanishing twin syndrome)! Apparently this is not uncommon so some relatives may have conceived twins but not gone to term with both!

I am now 14 wks pregnant and had everything crossed that it would be twins again as I had been told the chances were higher having already had twins (my twins will be 6 when this one is born) however, it is only one baby this time!

Ianina - posted on 03/07/2011

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I am pregnant with fraternal g/g twins and NO ONE on my side of the family had twins before.
As fas as I know, not all the fraternals are hereditary, but what I do know is if you had twins once, the chance of having another set increases.

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