Sunday, September 19, 2010

Measuring Ahead

Okay, it is probably obvious by now if you haven't heard directly. Erin is pregnant! But...with double the fun. Twins!

The official due date is January 9 but the latest the doctors will let Erin go is December 19. So within 3 months we will have 3 kids under 3. It'll be awesome!

Overall Erin is doing very well. The pregnancy is certainly a lot different than Evelyn. Erin is measuring about 10 weeks ahead (compared to a single baby pregnancy) and has to limit her physical activity. Erin worked until the day before Evie was born, but with the twins she had to stop work at 20 weeks.

Our twins have separate placentas, which means they are most likely fraternal.
Some fun twin facts:
  • The average length of pregnancy is 39-40 weeks for a singleton; 36 weeks for twins
  • The average birth weight for a singleton is 7lbs 7oz, and for a twin is 5lbs 5oz
  • About 35% of twins are left-handed, double the rate of the general population
  • 1 in 50 people is a fraternal twin in the USA, and 1 in 150 is an identical twin. 1/3 of all twins born in the US are identical, but in Japan the figure is 2/3.
  • If you are a fraternal twin, you have a 1 in 17 chance of having twins. If you are identical, it doesn't affect your chances, and they remain from 1 in anywhere from 38 - 90, depending on if fertility drugs are used or not. If your mother is a fraternal twin, you may have a higher than average chance of twins. If you father is a twin, it doesn't affect your chances, as fraternal twinning is apparently carried down the maternal line.

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Blogger Olivia said...

Congratulations!! I hope the rest of the pregnancy goes well! Erin - you look awesome :)

11:18 PM  
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