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I know in baseball boys are advised not to throw a curveball until they are mature because of the damage it can cause in their arm. ?Are there any limitations or suggestions as to what kinds of fastpitch pitches are safe to throw at different ages so as to protect a young girl's arm? ?For example, can throwing a curve or screwball damage a 12 year old's arm? ?What about a 14 or 16 year old? ?Are there any types of pitches to stay away from?