According to the sage Rabbi Shimon son of Yochai, King David wrote psalms about fundamental experiences in his life, including being a fetus in his mother’s womb, his birth, and being nursed. What psalm did he write about being nursed? He nursed from his mother and looked at her breasts and sang praise: ” Bless the Lord, O my soul, and forget not all His benefits [gemulav]” (Psalms 103:2). Gemulav means weaning, as is written about the end of Isaac’s nursing: “And the child grew and was weaned [vayigamal].” The scholars asked: What praise is there in the words “all His benefits”? Answer: That a woman’s breasts are on her chest, close to her heart, the location of understanding. The scholars went on to ask: Why did G-d create the woman’s breasts on her chest and not like other animals, whose teats are on their bellies, close to their sexual organs? Answer: So that the infant, when being nursed, will not look at its mother’s sexual organ. A different scholar, Rav Mattena, explained that it is so an infant will not nurse from a place close to her sexual organ, which is foul.”
(Babylonian Talmud, Tractate Berachot 10a)