I really hate studies like this because every situation with very child is so unique. As pp have said most kids thrive, but some are traumatized. I really believe that early daycare should be encouraged full time in some situations as some kids would learn more and be safer in child care than at home. Likewise some children would thrive better at home. Silly to generalize. My kids are both loving dc at the moment, but ds1 did not adjust as easily as ds2. I don't think any parent should feel guilty about sending their kids though, so it is nice to read an article that doesn't make the decision harder and more guilt filled than it already is.