I'm sure this topic has been discussed to death around here...

What are some gentle methods for getting an infant to sleep/nap quicker?

DS is 3.5mo and sleeps well at night (lately 10pm-7am, feeding, then back to bed). But it usually takes too long to get him down, especially for naps. He will not nurse to sleep. We swaddle him, then rock, shush, whatever (while he's screaming usually), until he calms down and falls asleep (or mostly asleep). I'd love to be able to swaddle and put him down. But I think he is too young for CIO, and I'm not sure I'm OK with it anyway.