In 1635, Rembrandt and Saskia moved into their own house, renting in fashionable Nieuwe Doelenstraat. In 1639 they moved to a prominent newly built house (now the Rembrandt House Museum) in the upscale 'Breestraat' (eng.: 'Broadway'), today known as Jodenbreestraat (Jodenbreestraat 4,1011 NK Amsterdam-now) in what was becoming the Jewish quarter; then a young upcoming neighborhood. The mortgage to finance the 13,000 guilder purchase would be a primary cause for later financial difficulties. Rembrandt should easily have been able to pay the house off with his large income, but it appears his spending always kept pace with his income, and he may have made some unsuccessful investments. It was there that Rembrandt frequently sought his Jewish neighbors to model for his Old Testament scenes. Although they were by now affluent, the couple suffered several personal setbacks; their son Rumbartus died two months after his birth in 1635 and their daughter Cornelia died at just three weeks of age in 1638. In 1640, they had a second daughter, also named Cornelia, who died after living barely over a month. Only their fourth child, Titus, who was born in 1641, survived into adulthood. Saskia died in 1642 soon after Titus's birth, probably from tuberculosis. Rembrandt's drawings of her on her sick and death bed are among his most moving works.