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When Lesley and John Brown approached Drs. Steptoe and Edwards for help conceiving, the doctors had already made about 80 unsuccessful attempts with their experimental method. So, what made the Brown’s attempt different? Steptoe and Edwards’ previous attempts all involved letting the fertilized egg divide into 64 cells (about 4-5 days of development) before being implanted into the mother’s womb. In the Browns’ case, the doctors decided to implant the egg after only 2 and a half days, which could have led to their success.