DD was the same way from about 4 - 6 months. Once I finally learned her patterns, we did end up bottle-feeding for the entirety of 4 40 minute naps each day. She napped after approximately every 1.5 hours of awake time, then slept a 12 hour night. I sat with her in the rocking chair the entire time, though it sounds like you may not have to do this if your LO can go to sleep OK by himself. Honestly, I grew to really enjoy that time with Bea. We had been SOOOOO frustrated about sleep for so long, and suddenly it became so easy. All I had to do was sit quietly in a cozy room, snuggling my beautiful baby, smelling her hair, hearing her breathe...It helped us to reconnect after struggling for so long over naps. I had to let go of the idea of doing chores or having time to myself during the day, but I think it was worth it. The good news: Around 6 months Bea started skipping right through that one-cycle wake-up and could sleep for 2.5 hours. She did this completely on her own. At first it happened sporadically, then on a more regular basis. The bad news: Now, at 7.5 months, she's back to short naps, but tends to only take two or three, or sometimes a longer nap and a short nap. Whenever we feed, I give her the opportunity to nap. It's not super-convenient, but it works for us. Bea also can now fall asleep in different ways, so if she doesn't fall asleep to a bottle I can put her into bed. So, from a catnapping veteran, all I have to say is give you LO the opportunity to nap frequently, don't let there be a lot of stress associated with sleep (forcing a nap, getting all frustrated when you can't get the nap to extend or put the baby down for naps, etc.), and trust that his/her sleep will mature and change over the next two - three months.  Heck, even if naps are still annoying, at least they'll be less frequent.Â
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As for a routine, we start with a diaper change, then take the long way to the bedroom, slowly turning out lights, shutting shades, and saying good nights along the way (Good night, Bella-cat! Good night, Tom Ashbrook! Good night, bathroom!). This has become Bea's major sleep cue and even helps when we're trying to nap in an unfamiliar place.Â
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I really, really, REALLY understand what you're going through, and how it can feel like naps have taken over your whole life. Wishing you the very best of luck.