two baptisms, two wet ones to go please, pt.2

I'm having my two youngest boys baptized in late June. For the younger of the two (1), it'd be a regular baptism with the normal 40-minute preparation class earlier that week. For the older one (7), I might have to do a reaffirmation of faith on his name. Well children are baptized as an extension of faith of the parents. Nonetheless I don't know what to expect. After all, my oldest child (17) was baptized in a Catholic (not Protestant, not Presbyterian no less) church with water and oil and I can't recall any prior preparation.