A 40-year-old Dagenham man has been hailed a hero after smashing through a window to help save the toddler involved in yesterday’s horrific triple stabbing. Davey Holland, a dad-of-six, burst into the property after receiving a knock at his door from the blood-soaked mother. He smashed open a window as the suspect was being treated by an off-duty police officer. The suspect, who is in his 40s, was arrested on suspicion of attempted murder. He left three victims, who are believed to be known to each other, including a two-year-old boy and eight-year-old girl. Recounting yesterday’s horrific 5.3…