Don't know if anyone saw this, but I thought it was really interesteing. Scientists are proposing that neaderthals weaned much sooner than previously thought--introducing solids at 7 months and ceasing breastfeeding at 1.2 years.

http://www.nytimes.com/2013/05/23/science/from-neanderthal-molar-scientists-infer-early-weaning.html?_r=0