The midwives in the bottom right are likely in reference to the Protoevangelium of James. I would further suggest that they are a type of Shiphrah and Puah.

19. And I saw a woman coming down from the hill-country, and she said to me: O man, whither are you going? And I said: I am seeking an Hebrew midwife. And she answered and said to me: Are you of Israel? And I said to her: Yes. And she said: And who is it that is bringing forth in the cave? And I said: A woman betrothed to me. And she said to me: Is she not your wife? And I said to her: It is Mary that was reared in the temple of the Lord, and I obtained her by lot as my wife. And yet she is not my wife, but has conceived of the Holy Spirit.

And the midwife said to him: Is this true? And Joseph said to her: Come and see. And the midwife went away with him. And they stood in the place of the cave, and behold a luminous cloud overshadowed the cave. And the midwife said: My soul has been magnified this day, because my eyes have seen strange things — because salvation has been brought forth to Israel. And immediately the cloud disappeared out of the cave, and a great light shone in the cave, so that the eyes could not bear it. And in a little that light gradually decreased, until the infant appeared, and went and took the breast from His mother Mary. And the midwife cried out, and said: This is a great day to me, because I have seen this strange sight. And the midwife went forth out of the cave, and Salome met her. And she said to her: Salome, Salome, I have a strange sight to relate to you: a virgin has brought forth — a thing which her nature admits not of. Then said Salome: As the Lord my God lives, unless I thrust in my finger, and search the parts, I will not believe that a virgin has brought forth.

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