1 O God, great Father, Lord and King,
our children unto you we bring.
We come in faith and hope and love;
we dare your steadfast word to prove.
2 Your covenant blessing did of old
our parents and their seed enfold.
That ancient promise stands secure
and shall while heaven and earth endure.
3 Look down upon us while we pray
and visit us in grace today.
These little ones you did receive;
your precious promise we believe.
4 They now the outward sign receive;
your promised Holy Spirit give.
O keep and help them by your power
in every hard and trying hour.
5 Direct their feet in holy ways
and shine on them through darkest days.
Uphold them till their life is past
and bring them all to heaven at last.
"O God, Great Father" alludes to the gospel story of bringing little children to Jesus, especially in stanzas 1 and 3 (Mark 10:13-16). The Reformed view of God's covenant shows up in stanza 2, and the work of the Holy Spirit appears in stanza 4.
Stanza 5 is similar to the consecration prayer that follows the act of baptism in the Psalter Hymnal's baptism forms.
Bert Polman, Psalter Hymnal Handbook
The inclusion of children at baptism is taught in Heidelberg Catechism, Lord’s Day 27, Question and Answer 74 when it says, “Children as well as adults are included in God’s covenant and people” and Belgic Confession, Article 34 which says, “…our children ought to be baptized and sealed with the sign of the covenant…"