Personally I see breeding as a life priority, and financial stability as something to work on alongside it.
I think if you put money first you end up becoming selfish then later on choose not to have kids so you can hold on to your pennies (or have only one child so you don't have to spend as much).
Another disadvantage of having kids later is that you lose practice in how to deal with them so when they do finally come along you become unsure of what do to.
If you're abstaining from relationships to persue career goals first (a lot of guys are like this) you will have no clue what to do when it finally comes time to get into a relationship.
+ A young brain will bond better with a child than an old brain.
Relationships, kids, sex etc... best to start early in life. Ideal age for kids: 25.