Rashi on Exodus 1:16/רש"י על שמות א׳:ט״ז

1בילדכן WHEN YE DO THE OFFICE OF A MIDWIFE — This word (the Piel) has the same force as בהולידכן (the Hiphil): when you assist them to give birth.

2על האבנים UPON THE STOOLS — the seat for the woman in the act of childbirth; in another passage (Isaiah 37:3) Scripture terms it מַשְׁבֵּר. Similar is, (Jeremiah 18:3) “He was at work on the אבנים" — the place of the vessels of (being produced by) the craftsmanship of the potter.

3אם בן הוא וגו IF IT BE A SON etc. — He was particular only about the male children because his astrologers had told him that there was to be born to a Hebrew woman a son who would become their deliverer (Exodus Rabbah 1:18).

4וחיה has the same meaning as ותחיה THEN SHE SHALL LIVE.