I would leave the choice up to the local council to make the decision and go by their judgement for these are the men God has called to take care of you and your family spiritually. I do imagine that the majority would not baptize a child (after all we are all somebody's children and under our Parents in some sense till we die) past 11, 12, 13 max until he or she would be able to give a credible profession of Faith. I know the argument that all males in Abraham's household, not just the children, were circumscized however the New Testament (and historic Reformed Theologians) have never said that circumscision and baptism are 100% identical in nature and function just girls are included. There is, like in the covenant of grace, changes and continuality.
But these are just thoughts of a lay person so take them for what they are... midnight thoughts on an important subject that ought to be given weeks of thought before posting.
Joseph P. Grigoletti II
French Marketing Specialist for Logos Bible Software/Spécialiste du marketing pour Le Logiciel Biblique Logos
Member of l'Église Réformée St.Marc in Québec(QC)(a member of the Église Réformée du Québec-ERQ) for another month or so.