6wks pregnant with twins that are different insize

Cassandra-lee - posted on 12/04/2010 ( 30 moms have responded )

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I just found out I'm pregnant with twins but they are very different in size, is this a common thing at this age? I know that when they are born one will be bigger than the other, just not sure about now. should I be worrried?

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Denise - posted on 12/10/2010

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No don't worry because when i was pregnant with my twin boys the ultra sound said they were 2 week apart but in the end all was fine and they were only 1 pound apart in weight.

Tracey - posted on 12/10/2010

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my boy identical twins were about the same difference at 10 weeks. We weren't too concerned and doc didnt say anything but did monitor frequently which sounds like you are getting. Mine were 3lb 4oz different at birth and did have TTTS but were fine. The smaller twin has never caught up and now there is nearly a stone difference! But both have always been healthy. Let the doc do the worrying for you!

Candi - posted on 12/10/2010

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Hello! While you probably have nothing to worry about (twins are often different sizes) there are several questions you need to be asking as you go in for each of your sonograms. First, you should request that your doctor give you sonograms either every week or every two weeks. You need to monitor the babies' progress. Second, go in with this list of questions from the TTTS Foundation: http://www.tttsfoundation.org/help_durin... My boys did have TTTS, and they both survived. So, I can tell you that even if you have TTTS, which I think may be what others will mention to you, it's not a death sentence! However, you do need to fight to get your doctor to talk with you about it, and if it turns out that it is the case that you do have TTTS, then you should be referred to a doctor who specializes in dealing with it, even if you have to go to another state. Educating yourself, asking questions and being pushy about making sure the doctor pays attention to you NOW are the best ways you can be protected. You and your babies are going to have an amazing journey together! I hope you enjoy every minute of it and that everything goes well for you.

Liz - posted on 12/10/2010

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With my first ultrasound at 18 weeks ( had insurance issues and trouble finding a doctor before then) My b/g twins were measuring 4 days different in gestation, but by the next ultrasound they were measuring where they should be. It completely baffled the doctor because for the second and third scans I was at a different doctor.

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Cassandra-lee - posted on 12/14/2010

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Thanks to everyone for all your help. I just wanted to let you all know that I've been for another ultrasound and the twins are doing well, they are only 2 days apart in size now with healthy heart beats. So thankyou so much for your comments they put my mind at ease so much. Cassie

Jessica - posted on 12/11/2010

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I didn't find out I was having twins until I was 12 weeks pregnant. They were initially the same size, but by 20 weeks they were saying there was a noticeable difference. I had my boys just before 38 weeks and they were saying about a pound difference. Baby A was 8lbs 3 oz and Baby B was 4lbs 13oz. They are 2 months and still have a about 3lbs between them. But, the reason I am writing this is because my little guy went through almost every possible test within the first month of his life. The doctors tried their hardest to find something wrong because he came out so much smaller. They couldn't find anything! ;) So, they may have a size difference, but it doesn't mean that your babies won't be healthy.

Jennifer - posted on 12/11/2010

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okay, I really need to go back to the fact that she should be speaking to her doctor about the risks associated with multiple births. I know we are trying to be helpful but searching the web for information will give you lots of direct, at times worst case scenarios.......I totally respect that everyone has had different experiences and is sharing to be helpful....

I do agree that you should be getting regular sonograms and should be seeing a high risk OB -not because of the size difference but because any multiple birth does fall under high risk. If you aren't, please ask why....it could be a health insurance issue.
And yes, be pushy! The doctors work for you, not the other way around!

Tricia - posted on 12/10/2010

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I am a mom of 14mth old twins. My girls were always different in size. You will be monitored closely, to ensure proper growth, but I would not worry. It's very early in your pregnancy, plenty of time for "Baby A and Baby B" as they call them to grow!! Try to relax, your doctor will tell you if there is cause for concern :-)

Mayra - posted on 12/10/2010

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I wouldn't worry so much, sometimes the ultrasounds are wrong, I had b/g twins on July 3rd 2010 and the ultrasound said that both babies were in the 5lbs range, my girl was 5.12 lbs and my boy was 4.2 lbs that was a big difference, so don't worry to much about it.

Serena - posted on 12/10/2010

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hi i had identical twin girls that are now 4years old and all their life they have been different in size nothing to worry about they catch up later in life trust me

Maritess - posted on 12/10/2010

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I agree w/everyone in that if your dr isn't worried you don't need to worry. They keep a close eye on you anyway b/c any multiple birth is 'high risk.' My b/g twins have always been very diff in size..not sure about 6 wks, but def when they were big enough that you could see them 'spinning' around inside me. They were 2 lbs & 1 3/4" apart @ birth & are now @ 5 yrs old 17 lbs & 6" apart, so they don't even appear to be twins, LOL. Good luck & I wish you the best! The early months/years & the most difficult, but it does get easier I promise! :o)

Penny - posted on 12/10/2010

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My b/g twins were 1lb and 1" different in size when they were born. I had a complication with one of my placentas...quit feeding baby "B" and had to have them early. I think for the most part...size difference doesn't matter too much...as long as your Dr. is monitoring as you progress with your pregnancy. My twins were born almost 20 years ago...and technology is far advanced compared to then, so I you don't have a lot to worry about. Good luck...it's quite a ride, but a fun one!

Jessica - posted on 12/10/2010

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Please try not to worry, my twins were also diffrent in size through out my whole pregnancie. Try not to worry unless the doctors tell you they are worried. My twins are now five!

Cassandra-lee - posted on 12/08/2010

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Thankyou Jennifer, you have really helped to put me at ease and a smile on my face to, thanks

Jennifer - posted on 12/07/2010

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Your babies will be just fine! Take care of yourself and enjoy the experience..being a mommy of twins is super special. But seriously, you should not be afraid to ask your doctor about anything that you don't understand, frightens you, etc and you don't have to wait for your appointments-call them. And remember, after they are born, your twins will be different, even if identical. Different in personalities, likes and dislikes and so why not size? My twins were and still are a pound apart and an inch apart in size. They were born premature and "caught up" in less than a year. Doctors know a lot about the care of multiple birth pregnancies and they are paying attention. So...take a deep breath, think good thoughts and have some extra milk! :)

Cassandra-lee - posted on 12/07/2010

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Thankyou eveyone for your comments its has really put my mind at ease. I'm due for another ultrasound on the weekend so hopefully the smaller baby will have caught up a bit.

Jennifer - posted on 12/07/2010

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No. And if you are worried, you should talk to your pediatrician about it for sure. Chances are the smaller of the two will catch up. But as long as they are healthy in utero, you are healthy and their amniotic measurements are okay, the babies should be just fine.

Shannon - posted on 12/07/2010

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My fraternal g/g twins were estimated to be about a week apart gestationally at 9 weeks. They ended up splitting the difference for my due date. The girls were pretty much the exact same size later in the pregnancy and after they were born though. There was concern about TTT so we saw a neonatologist weekly throughout, they couldn't tell if they were identical or fraternal.

Might ask about TTT and seeing a neonatologist to confirm the babies are ok, otherwise, if your dr isn't concerned and you trust them then you just have to go with that trust.

Cindy - posted on 12/07/2010

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i have to agree if ur doc isnt too concerned thats good but since u are havin twins they would keep a close eye on u and tour placenta are they sharing a placenta cuase my twins were to make sure so more ultrasound and doc appt

CHERYL - posted on 12/06/2010

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I no it my sound strange im sure ive heard in a case that a lady become pregnant again aweek after.ovulating twice.

Heather - posted on 12/06/2010

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I would agree with the statement that if your doctor wasn't concerned than you shouldn't be either. If your doctor was worried, then he probably will be keeping a closer eye on your pregnancy.

[deleted account]

Not trying to worry you, but that's a pretty big size difference for that age. If they were farther along it would be different. Embryos grow pretty consistently at that age and 6 days is a big difference. If an egg only survives 24 hours, and assuming you ovulated twice, the longest stretch between ovulation could theoretically be about 24 hours. 24 hours (ov) + 24 hours (egg survival) would mean a 3 day difference would be OK, but six days is a lot. You can also add in a little fudge for bad ultrasound measurements, but I wouldn't expect someone to be that far off. Was the heart beating on both twins? That would be very reassuring if so. Speaking from my own experience, during my first pregnancy, I was pregnant with triplets -- two identical and one fraternal. One of the identical twins was significantly smaller than the other two (about half the size at about 6 to 7 weeks). The smaller baby didn't survive -- it stopped developing around 8 weeks and just reabsorbed. I went on to deliver healthy twins. Those twins developed a size disparity as the pregnancy continued, but not until later in the pregnancy. There was a two pound difference at birth. I think the best judge about whether to be concerned is whether your doctor is concerned. Based on my own experience, I would be worried that the smaller twin won't prove to be viable. I would talk to your doctor if you are concerned. Again -- not trying to scare you, just giving you my opinion based on my experience. Good luck -- I hope everything turns out twinny for you!

Khadijah - posted on 12/06/2010

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I would say its pretty normal. I had my first sono at 7 weeks also, and throughout my entire pregnancy one of my twins was always bigger than the other. Even when they were born one was larger by almost a pound. And even now (they are 22 months) they still stay within a half a pound to a pound apart in weight.

Cassandra-lee - posted on 12/06/2010

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I was just concerned and was wondering if it was a normal thing or not at 6wks. They are 6.2mm different in size and 6days difference.

[deleted account]

How different is "very"? At 7 weeks the difference should be in millimeters. Are you talking in gestational age? E.g., one is measuring 6 wks 3 days and one is measuring 7 wks? I don't know that you can predict much of anything in terms of birth size that early. If they are fraternal, it could just mean one was fertilized later than the other. I think we need more information to give any advice!

Amber - posted on 12/05/2010

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My b/b fraternal twins where ALWAYS different in size. I had many many sonograms throughout the pregnancy and "baby a" was always bigger. When they were born he was just over a lb more than "baby b". But, funny thing is "baby b" is now bigger and has been since around 10 months. There is only a few ounces difference between the 2 now.

Kamoo Jai - posted on 12/05/2010

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my girl was a lot bigger than the boy even at the time of birth......their height and weight is almost the same now at 20 months...infact my boy weighs sligtly more....

Jessica - posted on 12/04/2010

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I had my first sono at 7 weeks and I had one baby a lot bigger than the other and they closely monitored it for a week and then it was fine. My girls were always about 1/2 lb apart

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