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He turned 4 at the end of May. He's been reading for six months or so, and is generally able to follow one-step instructions when we're right there with him, but telling him to go somewhere else and do something, then come back, seems like a nonstarter.

I'd put this more under the heading of attention, not language comprehension.

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He also really struggles with spatial relationships - doesn't seem to know what to do with directions like "look under the couch" or "look behind the curtain." We know that he has sensory processing issues (as does DD8) - is this part of that, or should we be looking for something else?

This comes under the math section of the PBS tracker, which would indicate your 4 year old is right on target in still developing these skills:

http://www.pbs.org/parents/childdevelopmenttracker/four/mathematics.html
Originally Posted by PBS site
Throughout this year, some four-year-olds will understand and use words representing physical relations or positions (e.g., "over," "under," "above," "on," "beside," "next to," "in front," "behind," "in," "inside," "outside," "between," "up," "down," top," "bottom," "front," "back," "near," "far," "left," "right").

They place this as a late 5 year old skill for the average child.

Last edited by geofizz; 09/21/12 12:53 PM.