Im not entirely sure, I think it could be on avg an inch. It depends on the individual. I've been told they grow a foot a year for the first three years of their lives.
Size:
Ball Pythons range in size from three to five feet with females typically being the larger of the species. Some individuals can reach six feet but they are less common. They typically grow about twelve inches per year for the first three years and then slow down until they reach their maximum size.
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