Rare for kids this young to murder, there was something similar in England years ago when two young boys killed a toddler.
Two 10-year-olds, Jon Venables and Robert Thompson, tortured and killed James Bulger, a 2-year-old, and were sentenced to life.
Crime happened in 1993, but UK being a soft socialist country, they got out on parole in 2001. However, it is lifetime parole, so one of them went back in the slam last year, sentenced to 40 months for breaking the parole provisions; and it's likely they both will be in and out of gaol for the rest of their stinking lives. They should have been hung,