מֵאֵ֨ל אָבִ֜יךָ וְיַעְזְרֶ֗ךָּ וְאֵ֤ת שַׁדַּי֙ וִיבָ֣רְכֶ֔ךָּ בִּרְכֹ֤ת שָׁמַ֙יִם֙ מֵעָ֔ל בִּרְכֹ֥ת תְּה֖וֹם רֹבֶ֣צֶת תָּ֑חַת בִּרְכֹ֥ת שָׁדַ֖יִם וָרָֽחַם׃
네 아비의 하나님께로 말미암나니 그가 너를 도우실 것이요 전능자로 말미암나니 그가 네게 복을 주실 것이라 위로 하늘의 복과 아래로 원천의 복과 젖먹이는 복과 태의 복이리로다
Rashi
מאל אביך means FROM THE GOD OF THY FATHER did this happen to you AND HE WILL HELP YOU also in the future (Genesis Rabbah 87:7).
Chizkuni
ברכות שדים ורחם, “the blessings of the breasts and the womb.” Yaakov paraphrases the blessings emanating from a celestial source, i.e. שמים, and emanating from earth, i.e. ארץ. An alternate explanation: the “blessings of the breasts,” are a simile for stilling thirst, whereas “the blessings of the womb,” are that the fetus will not be stillborn. (Based on Rash’bam) In this instance, the breasts appear first before the womb, although they are not needed until after the baby has been born, seeing that a mother begins to feel that she has a supply of milk even before the baby has been born. On the other hand, the prophet Hoseah, in Hoseah 9,14, says: תן להם רחם משכיל ושדים צוצקים, “give to them a womb that miscarries and shriveled breasts, in that order. (When he lambasts his countrymen for their disloyalty to G-d, and prays to G-d not to allow such people to develop normally.)
Da'at Zekenim
ברכות שדים, “blessings of the breast;” Joseph’s descendants were to be blessed with having ample supplies of milk to nurse their infants. Their wombs should also be blessed, so that they will have many children. The blessing also implies that none of his offspring should be bereft by the death of young children or by having children that are unable to conceive.