Комментарий к Охолот 12:4

סנדל של עריסה – the cradle of a baby that regularly is placed underneath its feet like a metal sandal for beauty or in order that it not rot/decay.

[With regard to] the shoe of a cradle, for which a hole had been made [in the ceiling to bring it] into the house [below], To hold a baby's cradle in place they would make a sort of shoe for the cradle and then attach the shoe to the ground. In this case the cradle is on the upper floor of a house and the bottom of the shoe can be seen in the bottom floor. In other words, they made a hole in the ceiling (of the bottom floor) to attach the cradle to the floor (of the upper story). There is a source of impurity below in the house.

שפחתו בתוך הבית (that was broken through within the house) – that the roof of the upper chamber was broken through/reduced that the crib is placed upon it and the sandal of the cradle is seen within the house from the reduction that is in the roof, and defilement is within the house.

If [the hole] is one handbreadth square, everything becomes unclean; If the hole is at least one handbreadth square then the contents of the upper floor are impure because the impurity can enter through a hole of that size.

אם יש – in the place of the breach.

But if it was not [one handbreadth square] its [uncleanness] is reckoned as one reckons with [cases of contact with] a corpse. However, if the hole is less than one handbreadth then the shoe that hangs over the corpse impurity has the same impurity level as the dead body itself. It defiles the crib and the baby, and we reckon impurity as we normally do. Anything that touches the shoe is a "father of impurity" and anything that touches it has first degree impurity and so on.

פותח טפח – it brings the defilement from the house to the upper chamber.

ואם לאו – that there isn’t there an opening of a handbreadth.

מונין בו כדברך שמונין במת – that the sandal and the crib are impure with a ritual impurity for seven days like the law concerning impure vessels that come in contact with vessels, but the baby is impure with ritual impurity until the evening, as it is taught in the Mishnah in the first chapter (Mishnah 2).