Your thesis that a male is only spurting some semen into a woman is basically correct.
The woman is basically only receiving the seamen (and both are having a lot of pleasure most of the time)
Basically the new life form is kind of a parasite: it's living in and taking from the mother everything it is needed to grow.
In that light, mother nor father should get congratulations.
Going to the base, for most man or woman, something they do for joy / fun is resulting in having a baby.
In the past you didn't choose for children, you just got them as a result.
Today you make a choice for having children - or you make sure you won't get them. Most of the time children are very, very much wanted and loved.
In the 9 months that a woman is expecting a baby, her body is changing due to hormones and so on.
About 2 months ago I did read in a newspaper (De Telegraaf) that research has proven hormonal changes in new fathers as well....
So much for the impact that a new baby is making...
And yes, I think both parents are to be congratulated with a new baby - but only when they want that baby - not because of the carrying and nurturing but because a child is most of the time a source of happiness.