Gaza authorities said more than 1,400 Palestinians, mainly civilians, including children, have already been killed and more than 6,000 wounded.
The images of the dead infants were included in the video played to NATO.
Hamas has denied its militants harmed civilians, accusing Israel and the West of spreading false reports to incite violence against Palestinians.
U.S. President Joseph Biden had suggested on Wednesday that he had seen images of children beheaded by militants.
Foreign reporters shown sites targeted by Hamas, witnessed ruins of burnt-out houses and streets scattered with dead residents and militants.
Persons:
Ronen, Netanyahu, Antony Blinken, Benjamin Netanyahu's, Blinken, Yoav Gallant, Jens Stoltenberg, Israel, Saleh Al, Arouri, Joseph Biden, Gallant, Lloyd Austin, Washington, Andy Gray, Crispian Balmer, Edmund Blair
Organizations:
Nova Festival, REUTERS, Israel, U.S, NATO, Hamas, Israeli, Brussels, Reuters, ISIS, Islamic, Gaza, U.S . Defense, Thomson
Locations:
Gaza, Israel's, Israel, JERUSALEM, TEL AVIV, BRUSSELS, Palestinian, Tel Aviv, Islamic State, Jerusalem, United States, Brussels