a recent paper claims that earliest signs are detectable at 3 to 7 months of age...
It depends on what you mean by analyze. It's believed the condition develops in utero. However, the DSM V criteria are difficult to assess in infancy.
There has been some recent research in this area, but it's far from conclusive. More study is going to be required. These references ought to be of use.
Jones, W. and Klin, A. (2013). Attention to eyes is present but in decline in 2-6 month infants later diagnosed with autism. Nature, 504, 427-431 doi:10.1038/nature12715Nichols CM1, Ibañez LV, Foss-Feig JH, and Stone WL.(2014). Social smiling and its components in high-risk infant siblings without later ASD symptomatology.
J Autism Dev Disord. 2014 Apr;44(4):894-902. doi: 10.1007/s10803-013-1944-2.
Elsabbagh M1, Bedford R, Senju A, Charman T, Pickles A, Johnson MH; BASIS Team. (2013). What you see is what you get: contextual modulation of face scanning in typical and atypical development. Soc Cogn Affect Neurosci. 2014 Apr;9(4):538-43. doi: 10.1093/scan/nst012. Epub 2013 Feb 5.
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