Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.
Lo - calling attention to a leading instance of the principle that all depends on God's blessing-namely, children.
Children are an heritage of the Lord - Genesis 33:5; Genesis 48:9; Joshua 24:4. As fathers bequeath inheritances to their children (Proverbs 19:14), so God gives to His beloved sons children as their "heritage." First, he gives a house, security, and competent means (Psalms 127:1-2); then children to enjoy them with and after their parents.
And the fruit of the womb is his reward - (Genesis 30:2; Deuteronomy 7:13.) "Reward," or hire, refers to Genesis 30:18, where Leah calls her son Issachar - i:e., a hire, or reward-because she regarded him as the reward given her by God for her disinterestedness in giving her maiden to her husband.