[11] After completing his education, he served for 15 months, as part of national conscription, in the Swedish Army at Hälsinge Regiment in Gävle and was honorably discharged as a second lieutenant.

[13] In November 2009 it was reported[14] that Westling was to step down as CEO and member of the Board of Directors of the Balance company though he would continue to be an equity partner.

On 24 February 2009, Westling and Crown Princess Victoria received the required consent of King Carl XVI Gustaf and the Government of Sweden for marriage.

[16] On 17 August 2011, the Swedish royal court announced that Prince Daniel and Crown Princess Victoria were expecting their first child in March 2012.

Daniel took his paternity leave and switched parental roles with Victoria when Estelle began preschool.

[22] The Duke of Västergötland is an honorary chairman of the board of the Swedish Heart-Lung Foundation and has given his name to Prince Daniel's Grant for Promising Young Researchers.

[23][24] Prince Daniel and Crown Princess Victoria established a foundation to mark the occasion of their marriage in 2010.

The focus of the foundation is to combat exclusion and promote good health among children and young people in Sweden.

[23] The couple took the initiative for Generation PEP, a non-profit organisation that works to raise awareness of and encourage commitment to issues relating to the health of children and young people.

[23] This project is a long-term partnership between Prince Daniel and the Royal Swedish Academy of Engineering Sciences.

But men, royal or not, had only twice before, in the 13th and 17th centuries, obtained new title or rank as the spouse of a Swedish princess, and even three queens regnant left no clear precedent.

At Stockholm Cathedral, he was also then made a knight of the Royal Order of the Seraphim and already wore its badge and ribbon upon emerging after the ceremony.