Although the marriage had been strained from the beginning, Teresa Cristina continued striving to be a good wife. Her constancy toward fulfilling her duty, along with the birth of children, softened Pedro II's attitude. The two discovered shared interests, and their concern for and delight in their children created a sense of family happiness. That they were sexually active and compatible is witnessed by the series of pregnancies which ensued. After the birth of their first son in February 1845, the Empress bore children in July 1846, July 1847, and July 1848—named Afonso, Isabel, Leopoldina and Pedro, respectively.