My ds does us a pacifier. That sometimes gets him to sleep, but other times (when I think that he is overtired) it's pretty useless. Sounds the same as your youngest, my ds gets into an angry screaming fit when I know that he is tired and wants to go to sleep but fights it. It's as if he knows that he should be sleeping, and wants to sleep, but just can't get there.
We do usually try to swaddle, but it's been 90 degrees the last few days, way to hot to swaddle. And lately, he's been getting angry when swaddled too. Kind of grunts and struggles until he "breaks free" of the blanket.
He does sleep at night, which we are thankful for. Usual schedule is that he sleeps from 7-8pm til about midnight. Gets up to feed for 30 mins, goes back to sleep until 4 am, feeds again, generally goes back to sleep until 7:30am - 8. We are pretty lucky that he's been on this schedule pretty much from 1 wk old or so. For the last week or so, his sleep times have been stretching from 8pm - 1 or 2am. I think we may be getting into a pattern change for more night sleeping, and less waking time for feedings.
I know that some babies don't need naps during the day, and if ds wasn't cranky, I wouldn't try to force sleep on him - but I know it's his tired cry. So I guess I just need to keep trying and be patient.
White noise seems like a good idea to try. Thanks!
silver