She is advocating infanticide isn't she?
So what is your point?
No. If you read her comment in context she is projecting how poor and desperate families justify infantacide. She advocated birth control to pre-empt their having to make that choice.
There is no point in making Sanger out to be more evil than she was. Many in her day were eugenicists, including leading politicians ... it was sort of a fad among the intelligensia at the time. They felt they were being humane. Even so, they did not hide their classism and racism as the ‘elite’ do today because PC hadn’t been invented yet. The eugenicists advocated sterilization and birth control on humanitarian grounds, much as the Humane Society does today to forego suffering in animals who overbreed. They were very matter-of-fact about it.
But Sanger never advocated abortion. In at least two places in her writing she spoke against abortion (and infanticide) ... not out of concern for the unborn or infants, but on behalf of women. In her day abortion was a very dangerous procedure which she called “barbaric”.
She also implied it was inefficient to handle overpopulation among the underclass in an after-the-fact fashion. She was convinced sterilization and contraception were the way to go to achieve eugenicist goals.
Finally, if Sanger had advocated abortion Planned Parenthood would proudly quote her in their literature. They don’t because she didn’t, a fact they don’t want people to know.