wing feathers

[Nimblefreckle]

My baby chicks will be one week old tomorrow. My question is about their wing feathers.
One of them has wing feathers that are blunt at the bottom and the other ones wing feathers are kind of pointy at the ends. Does that mean one is a male and the other female? Which one is which? One also stands more upright

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[sumi]

I tried feather sexing once and ended up with a roo called Heide

. I hear you should look at the length of the feathers when they are 1-2 days old. Even lengths vs one long, one short etc.

Here's a guide on how:

http://animalsciences.missouri.edu/reprod/ReproTech/Feathersex/index.htm