Kate Middleton: Is Extreme Morning Sickness a Sign of Twins?

OB-GYN Dr. Jennifer Ashton discusses the Duchess of Cambridge's condition.
2:02 | 12/04/12

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Transcript for Kate Middleton: Is Extreme Morning Sickness a Sign of Twins?
Let's find out more about this condition called hyperemesis, that kate has been hospitalized with. Abc news senior medical contributor, jennifer ashton. You've treated lots of expectant moms. People are causing this extreme nausea and morning sickness. But this isn't. It's in a different league. This is morning sickness like a tornado is a little wind. This is intractable throwing up, nonstop. You can't hold any fluids or food down. And in some cases, like we're seeing here, hospitalization is required. This is potentially a very serious situation for the mother. Most of the risks at this point in pregnancy, because it's so early, all really fall to the mom. You're talking about potential for dehydration, electrolyte abnormalities. And in some cases, malnutrition. I know a handful of women, one of them our own sharyn alfonsi, who suffered from this. If she's been hospitalized, what does it tell you? The brand diet and the healthy foods hasn't worked. We start with modifying the treatment. Small, frequent meals. Ginger tea, or low doses of vitamin b-6. And we see hospitalization with i.V. Fluids. In severe or worse cases, anti-nausea bipills. And in some cases, a semipermanent feeding tube. It is very, very serious. If she's been hospitalized this early in the pregnancy, that means there's a greater chance he'll be hospitalized again. Off times, we see people coming back again. This could be an indication there might be twins or possibly a girl. These are the associations we see in obstetrics all the time. More common with multiples. We'll have to stay tuned. Then, we have the problem which twin is born first? And might be exciting. Jennifer ashton, thank you. Let's go to josh for the latest on the other developing

This transcript has been automatically generated and may not be 100% accurate.

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