You can pull the weeds by hand (or use a weed hound) or you can wait until it's safe to use a weed killer.

Yup, sounds about right with springtime seeding.
Without knowing the grass type you planted or your location (not that this info really would change much anyway), all I can say is you'll have to wait it out and let them go. I wouldn't walk on the seedlings to pull the weeds either.

can you get a picture and post it?

hand pulling until late fall (when you've had the chance to mow three times) is probably going to be your only option now. I seeded in the spring on 04/05 and I have lots of chickweed and the beginnings of some goose-grass forming but I expected to be weeded out for the first year because of the spring seeding.

Hand pulling this year, over seeding in the fall and an extra dose of tupersan somewhere in the middle (selective pre-emergent safe for KBG turfgrasses) is going to be my plan of attack for this year but even 30% weed ratio is about 10% better than my entire lawn of weeds from last year.

Thanks for your responses! I suspected as much. : )

The good news is a lot of those weeds are annuals that will die out by themselves. So, that'll let you overseed in the fall, thicken up the area and have a lot less trouble with them next year.

There's more good news, too. Many weeds dislike being mowed, so when you start mowing reasonably regularly at least some of the weeds will die out. I ground my teeth during my reseeding last fall, but by the third mow the weed percentage was way down. Most of the remainder didn't survive the winter.

You can pluck out anything you can reach as long as you don't have to walk on the patch or lean on it. Right now, don't put any pressure on the new grass at all. Spring seedings are touchy enough without adding stress. Of course, everything but the first few feet can't be done, but it's better than nothing.