From the General Introduction the Rite of Baptism for Children it describes
in n. 29 what happens if baptism takes place during Sunday Mass. In 29-2 (d) it has:
“The general intercessions are taken from those used in the rite of baptism (nos. 47-48). At the end, however, before the invocation of the saints, petitions are added for the universal Church and the needs of the world.”
(From The Rites, Volume One, Liturgical Press, 1990, isbn 0814660150, page 374).
The Ceremonial of Bishops does not mention the litany of saints in the description of “Celebration of baptism within Mass” in the section “Baptism of Children”. It has:
“439 The bishop introduces the general intercessions. When these are over, the bishop remains standing at the chair as a presbyter says the prayer of exorcism and carries out the prebaptismal anointing.”
The litany of saints in the Rite of Baptism for Children only names five saints. It then has: “The names of other saints may be added …”. (n. 48).