Very nice, healthy looking Spotted. The clean, even, smooth growth is a real plus. Some breeders grow their Spotteds at such a ridiculous rate, they can look really odd. Yours looks very nice.

As far as sex, I've heard stories of Spotted going into brumation "ambiguous" and coming out the next year gaining sexual characteristics in a month. If it's supposed to be a "he", watch for "grooving out". The male concavity should begin to show up as an indented groove along the midline of the plastron. With each new growth, it will appear deeper and deeper.

Nice pictures.