May I recommend 'Liebster Jesu' from the Hymnal 1940 section on Sacraments (Hymn 186):

Blessed Jesus, here are we,
Thy beloved word obeying,
Now this child doth come to thee,
As thou biddest in thy saying,
"Let the little ones be given unto me; of such is heaven."

Words: Benjamin Schmolck (Translated by Winfred Douglas)
Music: Johann Rudolph Ahle