* Weight Gain
Early weight gain of up to ten pounds in the first trimester can result due to increased blood volume and uterine size. By the end of the second trimester, most mothers of twins have gained fifteen to twenty-five pounds, whereas singleton pregnancies usually produce gains of ten to twenty pounds.
* Measuring large for gestational age
Increased uterus size can be a strong indicator of multiple pregnancy. However, most women measure larger and show earlier with subsequent pregnancies, so don't be alarmed if you can't fit into your jeans after six weeks of pregnancy with your second child even if you didn't wear maternity clothes until twenty weeks with your first baby.
* Severe morning sickness symptoms, including nausea and vomiting
Some moms of multiples do report that their symptoms were increased with twins, as opposed to their singleton pregnancies.
at 11:47 PM on Jun. 26, 2010