[Ger-Poland-Volhynia] Bremen, Deaths of Sailors and Ship Passengers

[Mauricio Norenberg]

What are the primary sources to possibly get a death certificate from a
toddler who has passed away en-route?

Verbal history tells that my ggrandfather's 2 year old child, Paul
Nörenberg, passed away and was buried at the sea. But same toddler appears
later on, after arriving the destination.

The ship was named Wurzburg and the sail was in October 1908.

Where this death certificate would be stored, back to Germany or back to
the destination (Brazil) or both?

Online sources I found so far don't cover the year of 1908.

Any clues much appreciated