Is it possible to issue a baptismal certificate if the Baptism is a conditional one?

Yes, a baptismal certificate can be issued even for a conditional Baptism. However, it should be noted on the certificate that the Baptism is conditional.

What if the parents of a child to be baptized requests to put all the names of additional sponsors (i.e., say 28 additional sponsors) at the back of the baptismal certificate? What is the best explanation to dissuade them from this practice?

The baptismal sponsors are called the godparents of the baptized child, and they serve as the child’s second parents. Thus, the Church requires only 2 main sponsors. However, for varied reasons and at times, even commercial purposes, it has become a very common Filipino practice to invite more than one sponsors. To dissuade parents from this practice, only two names are indicated on the baptismal certificate.