At this age it can be very difficult to discern whether a child is displaying a condition at the high end of the
spectrumSpectrum-4 of Pervasive Developmental Disorders, or whether there are simply developmental lags that have the potential of eroding as development proceeds. To a certain extent, the potential difference between the two views is a moot issue because, at the bottom line, the focus is on promoting social development (including language), whatever technical diagnosis is assigned to the collection of symptoms or behaviors or characteristics. And efforts should continue to be directed toward keeping your son in the mix, so to speak, and not deferring to his inclination to shy away from social interaction. To defer to this tendency is only to invite more of the same.