Albert Barnes Commentary Lamentations 4:3

"Even the jackals draw out the breast, they give suck to their young ones: The daughter of my people is become cruel, like the ostriches in the wilderness." — Lamentations 4:3 (ASV)

Sea monsters - Rather, jackals.

Their young ones - “Their” whelps. The term is applied only to the young of dogs, lions, and the like.