Although some baby killers actually do use fire. Some use incinerators to dispose of the murdered little ones.
The options is biomedical waste pickup, which can get costly as they charge by the pound.
The cheap way is a garbage disposal. Grind up the babies and flush them into the sewer...
On second thought we make the Molech worshipers look like armatures.
I thought of the Aztecs, throwing people into the fires. You’re right, amateurs all. We’ve somehow ‘perfected’ it.