Grow up, Stemmie!

Details

A few good deeds and Lady Luck seems to be on your side! Or frowning down on your depending on your perspective - because now you're the proud owner of a Stemmelle, a baby Jammyx born from in-activated cells you keep buying. 
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Draw your Stemmelle growing up!
Do they go through a rebellious phase or do they stay a bookworm through and through?

RULES:

You must incorporate 3 stages of life into one image: baby, teen and adult! Each period should be distinguishable from one another and easily identifiable. Your adult design will be used as the basis for your Grown-Up Stemmelle, so design carefully!
- This prompt may only be completed with Stemmelle you own! Baby Jammyx created from usual MYOs cannot be used here!
- Artwork completed for gift art, commissions, trades or on bases CANNOT be redeemed for rewards.
- Artwork should have at least flat colors on a lined halfbody to be viable for rewards. Sketches are not acceptable submissions.