Coming from zero background in biology, I am looking for expert opinion on evidence regarding Trivers-Willard hypothesis (1973) and humans.

In short the hypothesis states that.
**If**

 1. "Condition" of offspring during their whole life are correlated
    to that of her mother during pregnancy
 2. Males have better chance of reproductive success than female in "good condition", and vice versa if you compare male/females in "bad condition".

Then it makes "natural selection" sense for females to vary sex ratio, more males when in "good condition" and more females when in "bad condition".

I think it is safe to say that plenty of evidence exists on assumption one. The second assumption seems more nuance in todays environment, but one would imagine that during most human history it does hold true.

Human data that I am looking at (but can unfortunately not share) shows higher sex-ratio in summer while [evidence][1] exists that timing of births in summer is also correlated with higher status of woman. Also apparent in my data: widowed woman show much lower sex-ratio than average.

Any reference (articles, researchers, journals) or comments would be superb! 

  [1]: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3777829/