The term LEAD-IN TO BOY OR GIRL can be solved by the crossword solutions ATTA (4 letters) and TOM (3 letters). ATTA is a shortened form of the word 'attaboy' which is an expression of approval or encouragement, usually directed towards a male. TOM is a shortened form of the word 'tomgirl' which is an expression of approval or encouragement, usually directed towards a female. Therefore, ATTA and TOM are both lead-ins to either boy or girl.