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See a split-screen ultrasound that compares 2D ultrasound imaging with 3D ultrasound imaging for a unique look at twin babies in the 27th week of pregnancy. At 27 weeks, your baby is growing quickly and developing important organs such as the liver and lungs.

Women who are pregnant with twins or multiples may experinece unique pregnancy symptoms. These can include larger and faster weight gain, increased uterus size, more severe morning sickness and fetal movement in early pregnancy. Factors that make some women more likely to have twins include twins in the family, advanced age and certain types of fertility treatments.

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