C. F. Keil and Franz Delitzsch on 2 Kings 19:3

2Ki 19:3 “A day of distress, and of chastisement, and of rejection is this day.” תּוכחה: the divine chastisement. נאצה: contemptuous treatment, or rejection of the people on the part of God (compare נאץ, Deu 32:19; Jer 14:21; Lam 2:6). “For children have come to the birth, and there is not strength to bring forth.” A figure denoting extreme danger, the most desperate circumstances. If the woman in travail has not strength to bring forth the child which has come to the mouth of the womb, both the life of the child and that of the mother are exposed to the greatest danger; and this was the condition of the people here (see the similar figure in Hos 13:13). For לדה instead of לדת, see Ges. §69, 2 Anm.