Dogs will attack people of all kinds and kill them and not for food. That's why packs are not allowed to roam. Even though the story is from the NRA, there is no known case where a human of any age has been attacked, unless they were in a condition I gave before. Yet livestock and pets are routinely prey. This shouldn't be taken to mean you can leave babies out alone unattended for a long time.
The coyotes are studying the situation and they know the baby is an adult human's kid. If it was a little dog it would have been grabbed to become dinner.