Evolution of humans; brain vs. pelvis

Which came first, the bigger pelvis or the bigger head? Both had to work together or nothing would have happened. The following article answers little, but offers lots of supposition:-http://blogs.scientificamerican.com/observations/2012/08/28/why-humans-give-birth-to-helpless-babies/?WT_mc_id=SA_DD_20120828

Complete thread:

Evolution of humans David Turell 2012-07-13, 02:58 PM
- Evolution of humans David Turell 2012-07-16, 04:58 PM
  - Evolution of humans; Cave at Chauvet David Turell 2012-07-17, 09:46 PM
    - Evolution of humans; Jerry Coyne David Turell 2012-07-18, 02:16 PM
      - Evolution of humans; Eating patterns David Turell 2012-07-18, 02:29 PM
        
        Evolution of humans; Chromosome 2 David Turell 2012-07-22, 04:49 PM
        
        Evolution of humans; Eating patterns David Turell 2012-07-26, 09:02 PM
        
        Evolution of humans; Bones vs. genes David Turell 2012-07-27, 01:57 PM
- Evolution of humans; brain vs. pelvis David Turell 2012-08-28, 09:45 PM
- Evolution of humans: Au sediba David Turell 2013-04-12, 09:36 PM
  - Evolution of humans: H. floresiensis David Turell 2013-04-17, 02:06 PM
    - Evolution of humans: the bush of human origins David Turell 2013-04-17, 05:49 PM
      - Evolution of humans: the bush of human origins David Turell 2013-04-25, 07:08 PM

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Evolution of humans; brain vs. pelvis (Introduction)