In my opinion that's a bit creepy. A child who is loved unconditionally can never understand unconditional love.

You can never see what's always there, such as the air we breathe. You can only understand it by logic and that's not until your teenage years, at the earliest. How could a toddler possibly understand love?

Edit: To clarity, of course you should love your children, unconditionally. But to teach them what unconditional love is, at an early age? Really?