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Woman Pregnant with Siblings

Woman Pregnant With Siblings, Not Twins

Carrying two babies, but they aren't twins? A woman goes in for her routine first sonogram where doctors see a healthy baby girl growing in the womb. Moments later, doctors hear a second heartbeat belonging to a younger fetus. They soon discover that the woman is pregnant with two children, two weeks apart in age, making them siblings, not twins.

An Arkansas couple appears to have a very rare case of superfetation, which involves conceiving while already pregnant. Doctors have only found about 10 other similar cases in history. While gross differences in the conception dates of the babies can potentially cause lung development issues in the younger one, these babies appear to be healthy and growing at normal rates. The babies have different due dates, but will likely be born at the same time. This should make birthday party planning a bit easier for the parents, because if they were born on their actual due dates, one would be born in December 2009 and the other in January 2010. Would you treat the children as siblings or twins?

Image Source: Getty
GlowingMoon GlowingMoon 8 years
I'm with Mandawahoo -- Same birthday, different egg/sperm = fraternal twins. People's chronological age begins at birth, not conception. If these babies are birthed on the same day, they will be the same age. The only exception is if one baby comes BEFORE 12a, and the next one AFTER 12a, then practically speaking, they would be one day apart (one baby would be one day older than the other one). I think that's the only age gap that would occur. JMHO.
LadyAngel89 LadyAngel89 8 years
I would probably have to treat them as fraternal twins, technically they'd be siblings and fraternal twins (resulting from the same pregnancy two separate eggs) regardless of conception dates it's still the same pregnancy. It's all a matter of perspective... they'll still be brother/sisters
mandaleebee mandaleebee 8 years
Same Birthday = Fraternal twins in my book. It just gets confusing if you're like, okay, same birthday, but not twins! I'm an identical twin, and would still consider myself a twin if we had different conception dates. We'd still share the same birthday.
rgrl rgrl 8 years
How did they know two babies were conceived two weeks apart? Just because one fetus seemed smaller than the other? What if they made a mistake? I sometimes question doctors because they do make mistakes. However if it is true it is very interesting and rare indeed. I did not know this was possible. Can someone be pregnant and still ovulate? Very unusual.
CaterpillarGirl CaterpillarGirl 8 years
I would treat them as what they are, siblings, not twins. Why lie?
MissSushi MissSushi 8 years
This is pretty interesting, and they are lucky they are so close together. As long as they aren't drastically premature, they should be close together in the lung development and probably fine.
jenni5 jenni5 8 years
That is crazy!
Zivanod Zivanod 8 years
Wow what a rarity! Although I know it can't happen, it's too bad these kids cannot be born closer to each child's EDD just to keep that uniqueness.
Chrstne Chrstne 8 years
They'd be like fraternal twins to me. This is interesting stuff.
runningesq runningesq 8 years
If there are only 10 documented cases, I think it's newsworthy. The babies will be born at the same time, I would think ... can you push one out and keep the other one in? Two labors/ deliveries within 2 months?
cordata cordata 8 years
Ditto, that's so interesting. I'd try to have them on different days, if possible.
FrankiLee FrankiLee 8 years
That is amazing! I have never heard of anything like that.
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