Your fantasy can probably be reality. The 'probably' is there because I don't know your situation. Twenty seven years ago, my wife took a three month maternity leave that lasted over 18 years. At first, I thought it would be impossible, what with student loans, a mortgage, an infant, college loan, etc. It can be done, and it's not as difficult as one would expect. Subtract all the "work" expenses of the stay-at-home parent. Subtract any/all of they day-care expenses of the child(ren). Add the tax benefits of going from __ class to poverty
If one of the partners (I'm busting my butt to be PC here, since I'm a new guy... ) Anyway, if one or both or all five are good at fixing things and haggling and finding great bargains, then life can be amazingly good. Not always as pleasant as those pushing their products on us would like us to believe, but by far more rewarding. And also see, that I said 'life' not existence.
Looking back, agreeing to that 'extended' maternity leaves was probably one of the best moves I made in my life. I'm trying to do the same thing again, under entirely different circumstances. Downsize all the crap and up size all that really matters, most of which cost zero dollars.