After all, an episode of Bones just said the other day that babies tend to resemble their fathers a lot in the first year due to a trait probably evolved to encourage feelings of protectiveness in fathers. Granted that assumes cavemen checked themselves in mirrors a lot, but still, it was ON TV, so it must be true.
I think it would make more sense if this trait evolved to elicit feelings of protectiveness from the mommy, not the daddy. As you say, mirrors have been in short supply during most of the course of human evolution, but the partner's face should be highly recognizable. And on an emotional level, I think I'd be more inclined to love and protect a mini-SO than a mini-me anyway.
It would also make sense because the mother is really the more crucial figure during that time.
			My daughter.
	    
	         - 15/01/2011 07:56:15 AM
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			For a minute there I thought she was teasing you.  - 15/01/2011 12:19:12 PM
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	         - 15/01/2011 12:19:12 PM
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	     - 15/01/2011 12:19:12 PM
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	         - 15/01/2011 12:19:12 PM
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			Untrue.
	    
	         - 16/01/2011 04:36:40 AM
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			I just had to give him crap.  - 16/01/2011 04:53:21 AM
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	         - 16/01/2011 04:53:21 AM
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	     - 16/01/2011 04:53:21 AM
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	         - 16/01/2011 04:53:21 AM
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			If that really is true...
		
	         - 16/01/2011 05:49:23 AM
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			Squeee!!!  How in the world did you put that child down long enough for her to learn to roll over?
	    
	         - 15/01/2011 03:57:25 PM
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			What great video quality! Grainy home videos are a thing of the past now lol *NM*
	    
	         - 16/01/2011 06:11:43 AM
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  I cheered!
 I cheered! Very cute. *NM*
 Very cute. *NM*