litcom.net.au/liturgy_lines/displayarticle.php?llid=168
Perhaps this will help.
The Sunday Mass need not be any longer than usual when the celebration of baptism is included. The rite of reception replaces the penitential rite and Gloria, with the opening prayer following directly after the signing of the infants. Instead of reciting the Creed, the assembly can be invited to join the parents and godparents in responding to the questions about the rejection of evil and profession of faith.
It is inappropriate to regularly substitute the readings for baptism for those set down for the Sunday. Only rarely might it be considered necessary to replace one of the readings with a passage more apt for the occasion.
The assembly’s participation is enhanced if they can both see and hear what is happening during the ritual. People should be invited to be seated and small children, family and friends encouraged to gather round the font.
So as you can see, at the place where the penitential rite & gloria would take place & the congregation is standing, the greeting & signing will take place.
Then during the creed, when the congregation would normally would be standing…we respond to the profession of faith in a question & answer “I do” as we would during Easter season…and we would be standing.
However, during the actual baptism. We should be seated.
