עָ֭לֶיךָ הָשְׁלַ֣כְתִּי מֵרָ֑חֶם מִבֶּ֥טֶן אִ֝מִּ֗י אֵ֣לִי אָֽתָּה׃
Upon Thee I have been cast from my birth; Thou art my God from my mother's womb.
Rashi on Psalms
Upon You, I was cast from birth I was cast from birth since You took me out of the womb, as Scripture states (in Isa. 46:3): “who are carried from birth.” From the time the tribes were born, He carried them and led them.
Radak on Psalms
Upon Thee I was cast from the womb: – for Thou art He who fed my mother with her sustenance, so that she could feed and bring me up. I was cast: the one who actually "casts" is the father and the mother, for he (the child) has not himself the understanding to cast his burden upon God. And so
Radak on Psalms
From my mother's womb my God art Thou: – for they confess Thee on my behalf.