Available in singular or plural from the adult's point of view & also from the child's point of view:

adult singular/plural:

During the times you feel most alone, (I/we) want you to remember this: (I /we) held you & loved you from the moment you came into this world & that's how it's always been for (me/us) & if you forget, (I am/we are) here to remind you as many times as you need.

child:

During the times I feel most alone, I never forget this: you held me & loved me from the moment I came into this world & that's always how it's been for me & if I forget, you are always there to remind me as many times as I need.