drspouse... sorry to come to this late, but I've just seen this. We admit children who have been baptised to Holy Communion before confirmation - typically from the age of about 5 or 6. There is a liturgy that is used. I've had a look online and have found the one that I've copied below, which is very similar to what we would use. The key thing is that the child confirms that she or he wants to be admitted to communion. In looking for that liturgy, I've found lots of resources online for children preparing for this, such as this and this.
As someone who regularly administers the chalice at Holy Communion, I will give the chalice to anyone who comes up for it. I don't believe that it's for me (I'm a layperson, but I can't imagine that if I were ordained I'd feel all that differently) to deny Christ to someone who comes to meet Him in that way. For me, it is such an amazing privilege to be able to offer Christ to people in that way... it's about God's generosity towards me, and my desire in a teeny tiny way to pass that on to others. If it was a very young child, I might look at the parent to confirm that it's OK, but I guess I just feel that I'd rather err on the side of over- rather than under-sharing (surely this is WJWD?).
Quite apart from anything else, the altar rail is not the right place to have that discussion, so if anything I might mention it to a priest afterwards and let them decide whether to make a conversation of it outside of the service.
FWIW I'd define my church as liberal Anglo-Catholic (? or something...!)
Anyway, here's the liturgy that I found:
The rite for Admission of children to Holy Communion before Confirmation
Those who are to be admitted to Holy Communion shall stand before the minister
Minister: In the name of our Lord Jesus Christ, we are now to admit these children to Holy Communion.
Churchwarden (or other suitable person): We present to you (the candidates are named) who wish to be admitted to Holy Communion.
The Minister addresses the children
Minister: When you were baptised you were welcomed into the Church. Today we continue to celebrate God’s love for you in Jesus Christ, to whom you belong. You are now to be admitted to Holy Communion. You will be able to share in the special meal given to us by Jesus as a sign of his living presence among us. It is our prayer that in the future you will be confirmed by the Bishop and will promise, with the help of the Holy Spirit, to go on following Jesus for the rest of your lives.
Minister: Do you wish to be admitted to Holy Communion?
Children: I do
Minister: Will you do your best to follow our Lord Jesus Christ?
Children: I will
Minister: Will you do your best to grow in the Christian faith so that later you will be confirmed by the Bishop.
Children: I will
Minister (to each child): N, I admit you to Holy Communion in the name of the Father, the Son and the Holy Spirit. May you find in this
sacrament the love and the presence of God in your life.
(The Minister addresses the congregation; children turn to face the congregation)
Minister: Will you as God’s people here do everything you can to support and nurture these children in their journey of faith.
Congregation: We will.
(Here a suitable book or Gospel may be presented to each child)
on behalf of the
congregation).