I personally find it hard to believe about babies being beheaded. I can easily see this as intentional propaganda or just honest misinterpretation of events/reports. I know it's definitely possible, but I find it hard to believe anyone could be that savage and would want real proof that it wasn't a one-off crazy person.
With that said, if there is proof and it wasn't a one-off crazy person, and Hamas does not apologize and promise to punish the perps ... then this is a 10 on the atrocity scale.