Please help identify what kind of grass I have, and what weed this is!

Hi, I live in the east coast in the philly suburbs. can anyone help identify what kind of grass this is?

also, this weed has been growing rampantly the past 2 weeks. I was told we cant put down any weed killers since we put grass seed down on bare spots. anything else we can do to reduce/ eliminate them?

thanks!

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Please help identify what kind of grass I have, and what weed this is!