My question is this- has anyone had a similar issue with a spouse and what ways did you approach it so as to not hurt feelings? My husband wants to be involved but he has doubts about this philosophy. Seeing is believing won't work because he barely sees the kids while they are awake some days!

Well there's two issues here. You do need to take his fears and doubts seriously. But he also needs to respect that since you're doing the research and the doing, that your knowledge of how children learn is growing by leaps and bounds while his is remaining relatively flat.

Is it 2 years each for a Masters and a Doctorate? Well you've had 4.5 years ;-) If you got a doctorate in English Literature, wouldn't he defer to you greater knowledge of Chaucer?

What you need to do is gain his confidence that you are gaining knowledge that is similar in scope. Confidence helps. Quoting things helps. Will he read? You could send him emails or leave books open or articles you've printed out in the bathroom.

You can't necessarily get him up to the speed that you are because you have a lot more time to spend so he's going to have to trade off that knowledge for confidence in you.