The growth tag is defined on eSix as "when a character is shown to be growing new body parts or muscles." However, it has often been used for characters who are growing in size or are growing their pre-existing non-muscle body parts. It may have also been used for weight gain, stuffing, or inflation, all of which are normally not meant to go with either growth, body_size_growth, or expansion.

• If a character is growing a new body part or a more muscular build, then specify what is growing. Only the most common types of these growths, not including genitals and limbs, are listed; anything else will have to be manually specified.
• muscle_growth will likely also need an accompanying muscle build tag manually added (i.e. muscular, big_muscles, huge_muscles, and hyper_muscles).
• If a character is growing in size, and they are not growing a more muscular build or new body parts, then tag body_size_growth and remove growth.
• Note that certain transformations, especially species transformations, may cause both body size growth and body part and/or muscle growth.
• If a character's already existing body part(s) is/are growing larger or longer, then tag expansion. Don't tag body_size_growth if they are not getting taller.

Note that this project may need further refinement and is subject to change.