DEAR DOCTOR K: I just found out I'm pregnant with twins. How will this pregnancy be different from my last one?
DEAR READER: Congratulations! Along with double the diapers and late-night feedings, you'll experience double the love, laughs and fun. But, yes, you will have to deal with some challenges. In the United States, twins occur in one out of every 35 births. Twins can be fraternal or identical. Fraternal twins occur when two eggs are fertilized. This produces two embryos; they are not identical, and may not even be the same gender. In fact, fraternal twins are genetically no more similar than other siblings.