In the Anglican and Catholic churches, and I think in some of the Protestsnt churches too, anyone can baptise in emergency provided they baptise in the Name of the Father, and of the Son, and of the Holy Spirit. It is not at all unusual for a midwife to baptise a newborn who might not survive.
I don't think JW baptisms have much in common with baptisms in the churches. JW baptisms are not only dependent upon individual informed commitment, but are dependent on the say-so of elders who may or may not be capricious in their interpretation of the rules.
Catholic and Anglican baptisms, the two I can speak with some authority about, see baptism as a sacrament which means a vehicle for God's grace in a very particular form. As such, baptism is not dependent on any human decision or whim of anyone in authority, but is a once-for-all special action of God's own. Also, it cannot be undone, and it cannot be repeated, which means, according to the beliefs of the Christian churches, that any subsequent baptism in, for instance, the JW system, has no real validity as in a sacrament, although of course it will have meaning and deep significance to the participants.