While the CCC does say that anyone can baptize, it is referring to only those cases in which the individual is in danger of death, but in all other cases it should be done by the ordinary minister of the sacrament, clergy or deacon. Baptism is such an important sacrament that most parishes require the parents (or candidate of baptism if the person is older) to take classes before the sacrament is received.
While it is a tragedy that your husband will not allow your child to be baptized, just remember that God’s mercy is infinite.
You’re doing the right thing waiting on the baptism, but if your child does come into the danger of death, then he should be immediately baptized.
It sounds as though your husband is following his conscience and doing what he believes to be right and godly, and that is to be commended. It sounds, also, like he has the best interests of your children in mind.
While a believers baptism is a Catholic sacrament, you should do what you can to raise your children in the Catholic faith.
I think the best course of action is regular prayer as a family, regular prayer for her husband, and Bible study together.
Hope this is a little helpful.