Sentence 1: My sister is going to have a baby. 
 Sentence 3: The doctor wrote it on a piece of paper to give to the baker 
 Sentence 4:  When we cut the cake, the inside was pink 
 Sentence 5:  It's a girl! 
 Option 1: She went to the doctor to find out if the baby is a boy or a girl. 
 Option 2: She went to the doctor to find out how far along she was.