Christy, this is what I recommend an artist needs to do to prepare for such challenge.
Get teen models, if you can, being a teen has a smooth face, and do multiple five minute scetches'. Do many of them. Do as many as it would take in order to minimize and solve issues that can arise when doing small children. Limit your self to half hour five minute spurts in which time you need to get all the essential. As you practice this method you will see what you need to better understand in order to get a perfect likeness and or character.
Try it.
All the best
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