"Bless the Lord, O my soul, and do not forget all His rewards. Rabbi Abba bar Kahana said, if a person takes a coin and places it in his mouth, the coins fall down. But this woman walks on two legs with her mouth downwards, and the fetus is kept in her womb and does not fall out like a person placed [on a ship] in the midst of the sea. This animal, which walks on four legs and gives birth, keeps the fetus inside and the woman, who walks on two legs, and yet the fetus is kept safe. Therefore, do not forget all His rewards. Rabbi Simon said, this woman is made up of poking [thin and fragile] parts, so if she had been left with one hour, she would have died. Therefore, do not forget all His rewards."...
How God Renews the Soul Like an Eagle in Flight
Midrash Tehillim 103:5