Adam Clarke on Leviticus 26:29

Ye shall eat the flesh of your sons, etc. - This was literally fulfilled at the siege of Jerusalem. Josephus, Wars of the Jews, book vii., chap. ii., gives us a particular instance in dreadful detail of a woman named Mary, who, in the extremity of the famine during the siege, killed her sucking child, roasted, and had eaten part of it when discovered by the soldiers! See this threatened, Jer 19:9 (note).