Ds read the directions on worksheets to the kids at his table at preschool, so all the kids, and many of their parents, knew he could read.

It gets better when other kids can read a little. When your dc starts talking about algebra or thermodynamics on the playground, you can just dismiss whatever he/she says by saying, "Oh, he/she must have read that somewhere," like you have no idea he/she is checking physic books out of the library.