In Great Expectations by Charles Dickens why does pip describe the seven little pockets as tumbling up instead of growing up?

Answer 1

Because they are so active and are always falling and because the kids were joyful yet not well supervised by the parents.

Answer 2

Pip describes the seven little pockets as "tumbling up" to emphasize the disorderliness and chaotic nature of organizing them in his suit. This choice of words conveys the sense of confusion and mishap Pip feels as he tries to make sense of the new additions to his wardrobe.