"I tell you the truth, unless you turn from your sins
and become like little children, you will never
enter the Kingdom of Heaven." --Matthew 18:3 (NIV)God knows what happens as we get older and the world takes away some of the wonder. He knows how, with age, we start to lose that abandon that sends us running into His arms. So, while God may have never expressed His saddened heart over watching a child grow up, He definitely expressed his sorrow over his children losing their child-like faith.
Maybe that's another thing we have in common with our Maker. We all want our kids to stay "cuddle size."