What would happen if I were to use a Mutagen on a pregnant mother? What about using one on the father while the mother is pregnant? If a pet has already had a child and I use a Mutagen on the mother, will it affect the already born child?

EDIT: To be more specific, how will all these things affect the unborn child?

lililira, the child's genes are defined at the moment of conception, just like in the real life. So the subsequent mutating of parents won't affect the child's genes.