The blessings here seem to be connected more with pastoral success, large and healthy flocks and herds, than with human fertility. This could be a simple word play but Biale's statistics would indicate otherwise. Blessings of the udder meant an ample food supply to an ancient pastoral people. Blessings of the udder meant the assurance that the flocks and herds would grow. It is possible to see some shadows of this understanding of El Shaddai when we see the form that idolatry and apostasy in Israel takes.
Linguistic evidence focusing on the forms of nouns certainly tends toward our interpretation.
For the common term 'El Shaddai' we will use the familiar spelling. All other representations of lexical items will be phonetic. Codex Leningradensis in this verse reads 'et shadday , which we correct to 'el shadday , reading with other Masoretic manuscripts, the Samaritan Pentateuch, and the Septuagint.