"Oruaseht", contributor to a discussion group of which I'm a member, observes that in his tradition, infants, Alzheimer's patients and people with Down's Syndrome can be baptized but are not allowed to receive the Body and Blood of the Lord in Holy Communion. He writes:
...Our Lutheran practice of making reason/rationality a requirement for grace really knocks the bottom out of sola gratia. It's sola gratia IF you have the necessary mental cognition. Grace with strings attached.