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He was born to a large family with eight other children. His family was poor, and when he was 10 his father fell sick and Robertino helped the family deliver bakery products to restaurants. He enjoyed singing folk songs on his way and was noticed by people for his singing voice. After a request to perform at a wedding in a restaurant, Robertino was sought after by other restaurants for the same services.
Robertino sang in Cafe Grand Italia where Neapolitan actor Toto and Danish TV producer Volmer Sorensen noticed him. Sorensen was vacationing in Rome with his wife, singer Grethe Sonck, who noticed the boy. Their interest in him led to performances on Danish TV shows. Robertino recorded an album while in Copenhagen.