After moving out of the crib we got DD a twin bed. We thought it was big enough for her to grow into but small enough that it was overwhelming. Well she's decided she wants a bigger bed, we do have a full mattress we could use, at this point, we didn't' initially use it because it was pillow top and it was too soft for her at that young. I'm not worried about it now at 3.

I'm willing to try anything to get her to sleep in her bed even if that means a bigger bed but DH think it's unnecessary!

What size of mattress does your LO have?