Are you seeing double or triple???
No, it's the likihood of multiples is increasing. Since many women are waiting 'til they're older before having children, they may need a helping hand. Invitro often results in multiples due to the number of embreyos placed in the womb. Also, the older a woman gets, the more liking she'll conceive multiples.
The number of twins born in 2009 almost doubled the 30 years previous. (Although this is a Canadian statistic, the U.S. and other countries probably are simular.) There are more sets of fraternal twins than identical ones and I assume this tread will continue.
Here are mine: