 Jigger and his shipmates , joined by Billy , then sing about life on the sea ( " Blow High , Blow Low " ) . The whaler tries to recruit Billy to help with a robbery , but Billy declines , as the victim — Julie 's former boss , Mr. Bascombe — might have to be killed . Mrs. Mullin enters and tries to tempt Billy back to the carousel ( and to her ) . He would have to abandon Julie ; a married barker cannot evoke the same sexual tension as one who is single . Billy reluctantly mulls it over as Julie arrives and the others leave . She tells him that she is pregnant , and Billy is overwhelmed with happiness , ending all thoughts of returning to the carousel . Once alone , Billy imagines the fun he will have with Bill Jr . — until he realizes that his child might be a girl , and reflects soberly that " you 've got to be a father to a girl " ( " Soliloquy " ) . Determined to provide financially for his future child , whatever the means , Billy decides to be Jigger 's accomplice . 
