Welp, Pickles found a great book at the library that is well below his reading level but has become a favorite (right with And Tango Makes Three)... Its called Ruby in Her Own Time and is about a baby duckling who does things a little behind her siblings, but when she is ready. She is hatches when she is ready, eats when she is ready, swims when she is ready... Its great and like I said my (advanced reading) 6.5 year old loves it. Would be good to pass around copies to "well meaning" nosey people too 
Here is an Amazon link

Here is an Amazon link






