Easing it in should work fine, just remember to place your sashing strip on the bottom so the feed dogs do their job by taking up the extra. ;-)

This would be my suggestion, too.

One can ease it in - but I think this suggestion would be what I would do.

By the way - what kind of ruler were you using? i had one set of rulers that had that "fat" line - and I actively dislike them now.

I like the Olfa frosted ones - they have a very thin line that might have minimized the "error" you made.

There is just a small difference, you could ease the sashing in, or, "un-sew" one square, then re-cut the sashing to the right size. It's probably never going to be noticed after quilting.

i have a June Tailor ruler. 3.5x24" ruler. One way it has a thin 2.5" line. The other way it has a thick 2.5" line. If I have to use it again, I would tape the thin line so I remember to only use that. At some point I'll probably upgrade to a 6x24" Omnigrip or Olfa, but for now the ShapeCut seems ideal. Have had only perfect cuts with it so far!

Thanks again to everyone for all your wonderful help!!!!!!!!!

Either ease it in or un-sew one of the cornerstones and restitch to take out the extra bit of white... no need to start over or overthink this

This is what I would do too. Easing it in would bug me too much.

I'd take one of the squares off, trim down the center rectangle and restitch the square on.

When I'm starting a new quilt, I cut enough pieces for 1 block and sew it together to make sure that everything will be the right size. If that block isn't right it usually becomes a pot holder or part of a sampler quilt.
Sharon in Texas

I think it will be fine once finished. The 3 year old will not judge you or care about that. Having the quilt as a gift is more important.