This occurs in Act I when Parris is essentially interviewing Tituba about what has happened out in the woods. He is asking who was with the Devil when he came to the girls while they were out in the woods.
Mrs. Putnam claims that Goody Osburn's experience as a midwife is proof enough that she might very well indeed be a witch. You see, Goody Osburn acted as Mrs. Putnam's midwife 3 times. In each case, the babies "shriveled in her hands". Mrs. Putnam seems to have a fear of Goody Osburn that she suggests might be a witch who causes children to die. But, it is important to note that Mrs. Putnam has now lost at least six children.