We are but little children poor [weak]. Cecil F. Alexander, née Humphreys. [Holy Baptism.] Published in Dr. Hook's Leeds Church Sunday School Hymn Book, 1850, in 9 stanzas of 4 lines. It is in use, sometimes abbreviated, in its original form; as "We are but little children weak” in the 1868 Appendix to Hymns Ancient & Modern, and numerous other collections; and as, “O Lord, the Holy Innocents" (st. ii.), in the American Protestant Episcopal Hymnal, 1871. In these various forms it is in extensive use.
--John Julian, Dictionary of Hymnology (1907)