Isabella gave birth to her first child on 30 December 1430 at Coudenberg in Brussels, a year after her marriage. The child, Antoine, sickly at birth, was christened on 16 January 1431, and soon after both parents left to attend to ducal business. By the autumn of that year, Isabella was once again pregnant with their second son, Joseph; more importantly, she had spent a long continuous period of time with her husband, and demonstrated her intelligence and abilities, as well as her commitment to Burgundian independence. Because of this, when Charles VII of France began attacking Burgundy in January 1432, Philip—leaving Coudenburg to defend Dijon—ordered that she represent him during his absence. Antoine and Joseph both died in 1432, but the duchess then gave birth to the future Charles the Bold on 10 November 1433.