It is often advantageous to enjoy you marriage life for at least 1 or 2 years before talking about having kids.
Reasons been that the woman you married start to change during pregnancy, at that time you might lack a lot of her attention and romantic care.
After she gives birth another woman with changes of character set in, she begins to focus her energy on the child, this is the stage where men usually cheat.
So for those contemplating getting married make sure you enjoy your marriage well first before kids start coming in.