I'm not Catholic, but I'm pretty sure they don't believe that salvation/forgiveness of sins happens at point of baptism.
that is one of the main points of baptism
.Baptism is an important sacrament because Jesus was baptised, and after his resurrection he told his disciples that they too should be baptised. ... It was John who baptised Jesus. Christians believe that baptising cleanses people from original sin and marks a person's official entry into the Church