Do the math

[potioncat]

No: HPFGUIDX 137900

Fabian: 
> Didn't he go to Voldemort first though and tell him about the 
prophecy? 
> What I don't get it is why he did this, if he's supposed to be on the 
> 'good side'. I mean that would mean:
> 1. Snape told Voldemort about the prophecy
> 2. Snape tries to figure out who the child is
> 3. Once he has found this out, he tells Dumbledore
> 4. Dumbledore asks why on earth Snape told Voldemort in the first 
place!


Potioncat:
DD said in HBP that the eavesdropper was in LV's employ. It crossed my 
mind that he could also already be in DD's as well...or not.

But the first half of the prophecy does not make it clear that the one 
will be born soon. It says born to those who thrice defied, and as the 
7th month dies. But it wasn't clear that it wasn't a child or adult 
already born. The last  half of the prophecy says "will be born".  So 
LV may have been looking at adult or young adult wizards who had been 
born in July.  

So, in August or so, Snape is reading the Daily Prophet between Muggle 
baiting and Poisen-potion brewing and sees the birth announcements for 
July. He says to himself, "Blimey! It's Lovely Lily's child that will 
do in the Boss." 

LV in the mean time tells Snape to go get a job with DD so that he can 
bring in more info. So Snape, now having a cover, goes to DD and tells 
all.

Or not.