From "More women have abortions as it loses stigma," in today's Telegraph (U.K.):
Ann Furedi, the chief executive of the British Pregnancy Advisory Service (BPAS), said ... there had been a shift in public opinion about parenthood. The stigma of abortion had diminished but there was now concern about being a poor parent. "Parenting is considered to be very important and is taken seriously these days," she said. "The idea of just drifting into unplanned motherhood is seen not to be a good thing and you could argue that among many groups of people in society abortion is seen as a more responsible response to being a victim of uncontrolled fertility," she said.
From Planned Parenthood founder Margaret Sanger, The Pivot of Civilization (1922):
"We should not minimize the great outstanding service of Eugenics for critical and diagnostic investigations. It demonstrates, not in terms of glittering generalization but in statistical studies of investigations reduced to measurement and number, that uncontrolled fertility is universally correlated with disease, poverty, overcrowding and the transmission of hereditable taints."
"Eugenics seems to me to be valuable in its critical and diagnostic aspects, in emphasizing the danger of irresponsible and uncontrolled fertility of the 'unfit' and the feeble-minded establishing a progressive unbalance in human society and lowering the birth-rate among the 'fit.'" [Click links to see context.]
If you search the Internet for "uncontrolled fertility," you will find that the overwhelming majority of references to it come from eugenics organizations and their direct descendents that now make up the population-control movement. The term is used by people who believe, as Ferado suggests, that, for the poor, killing an unborn child is "more responsible" than being pregnant.