As I understand it, the point of a christening was to provisionally enrol your baby in the ranks of the blessed, so that if he/she died in infancy, as so many children did before the mid-twentieth century, he/she could be buried in consecrated ground and would be admitted into heaven. Now most people expect their children to survive to adulthood, and also take a rather broader view of what's necessary to admit a child's soul to heaven, and, possibly equally significantly, the switch from churchyards to municipal cemeteries has opened up the concept of consecrated ground, christening has rather lost its practical applications.
And no, we haven't had Rowan christened: my husband is a Christian, but was raised in the Methodist tradition, where baptism doesn't take place until the child is old enough to make his/her own decision, and I am a pagan.