Mishnayos Chullin Perek 6 Mishnah 3

In the case of a deaf-mute, an imbecile, or a minor who slaughtered an undomesticated animal or a bird, and others saw them and ensured that the slaughter was properly performed, in which case the slaughter is valid (see 2a), one who oversaw the slaughter is obligated to cover the blood. If they slaughtered the animals among themselves without supervision, one is exempt from the obligation to cover the blood. And likewise with regard to the matter of slaughtering a mother and its offspring on the same day, if a deaf-mute, an imbecile, or a minor slaughtered an undomesticated mother animal and others saw them, it is prohibited to slaughter its offspring after them. If they slaughtered the mother animal among themselves, Rabbi Meir deems it permitted to slaughter its offspring after them and the Rabbis deem it prohibited. And the Rabbis concede that if one slaughtered the offspring thereafter that he does not incur the forty lashes, as it is possible the mother was not properly slaughtered.