They just mean your position in the forum based on your posts. PY, right now you are a "TODDLER"
POSITION
For all you newbies to forums, positions are preset terms for all members, and they are fun titles that show your history and activity in the forums. For the BrillKids forums, the Position changes as you post, and they are preset according to the hierarchy below:
NEWBORN - Required Posts = 0
INFANT - Required Posts = 50
TODDLER - Required Posts = 100
PRESCHOOLER - Required Posts = 250
SCHOOL AGE - Required Posts = 500
TWEEN - Required Posts = 1500