Europe's biggest economy grew 0.3 percent in the first three months - the slowest rate since the third quarter of 2016 - after expanding 0.6 percent in the final three months of last year.
Economists had on average expected growth of 0.4 percent, with forecasts ranging from 0.2 percent to 0.5 percent in a Reuters poll of 34 economists.
The statistics office said positive contributions in the first quarter came mainly from domestic demand while trade was weak.
(Reporting by Michael Nienaber; Editing by Madeline Chambers)
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