For everyone's information, the Baltimore Catechism is available in four editions, TAN Books offers all four.
Baltimore Catechism #1 has 33 lessons and is typically used for 2nd (First Communion) through 5th grade.
Baltimore Catechism #2 has 37 lessons and is typically used for 6th through 9th grade, including those preparing for Confirmation.
Baltimore Catechism #3 has 37 lessons and is intended for those who have been Confirmed and/or are in high school or older.
#4, An Explanation of the Baltimore Catechism, is often used as a "teacher's manual" for those teaching catechism, and as a reference work.
Baltimore Catechism #1 is a more basic, simplified version of the original catechism. Both my copy of #3 (Confraternity Edition published by Benziger Brothers) and #2 (available on the CMRI website), in Question 321, teach Baptism of Blood and Baptism of Desire.