Who IS ready for a baby?
That's really the thing, I've never met a parent, male or female, who was remotely ready for having a kid. Much like swimming, it's one thing to read about doing it and another thing entirely to actually jump into the pool.
I will say that men do not have the constant drum beat of "Have children have children" society pounds into women, so women are arguably prepared somewhat more by virtue of exposure.
Either way, though, nobody's ready. Some are just slightly better equipped.