Little ones - mean ones, the common people. The word is unique to Jeremiah Jeremiah 48:4.
The pits - i. e., tanks for holding water.
Covered their heads - The sign of grief.
Related Commentaries of Jeremiah 14:3
Jeremiah 14:3
3 And their nobles have sent their little ones to the waters: they came to the pits, and found no water; they returned with their vessels empty; they were ashamed and confounded, and covered their heads.