Siver Steffenson and family

Looking for the voyages taken by the family. Siver, born Sept 1813 in Norway, married in Varmland, emigrated alone from Drammen to Quebec in 1866, on ship Ekarius under Capt Blekfeldt (names uncertain). Already know voyage of wife Karin and three children in 1867. Children were all born in farm Husketorp or Hjerpeliden in Varmland. Daughter Anna, born May 7, 1842, emigrated from Norway with husband named Olson and daughter Serenna approx 2 years old. Anna was pregnant and gave birth on the voyage to a son, Otto. Anna's sister Martia, born 7/7/1838, emigrated with daughter Mathea Pederson around 1873. Another sister Kajsa, born 6/20/1846, emigrated around 1862. Is there a way to identify Anna's ship by the birth of her son on board?