HMMM WHAT IS THIS????

Month 1 = Weeks 1-4 Month 2 = Weeks 5-8 Month 3 = Weeks 9-13 Month 4 = Weeks 14-17 Month 5 = Weeks 18-21 Month 6 = Weeks 22-26 Month 7 = Weeks 27-30 Month 8 = Weeks 31-35 Month 9 = Weeks 36-40