THen OT is wrong about it being unhealthy for a 2.5 yo to learn. I agree if this child isn't interested yet, don't push, but if he is interested why stifle his mind!? Gifted children learn without anyone making a concerted effort to teach academic subjects.
Ex. My husband taught himself to read words and "graphs" and tell time at 3 by looking through the TV Guide for the next episode of Seasame Street. My children also did so much spontanously as toddlers, but I made sure not to teach them anything academic because I feared it somehow would rob them of a pleasant childhood.
I regret that decision now that I understand their needs better.