A child is on the mend after suffering a big scare over the weekend that left him with a broken leg. The 4-year-old’s family said he took a frighting fall six stories down from a window at a North Miami apartment complex located off Northeast 146th Street on Saturday afternoon. The child’s grandfather was home at the time, and he told 7News on Monday that he’s thankful the fall only led to a broken leg. “I was sitting here and then five or six m…