Hi I am looking for help so please be supportive if possible 
My DS is now 6 months old and he sleeps well at night, has a good bath, boob, bedtime routine and often (but not always) will go into his cot drowsy but awake and after a few grumbles fall asleep. He'll sleep until about 6.30 - 7.00 with one wake up for food in the night/early morning (I tried dream feeding and it didn't work). If he doesn't settle for the night at 7.00 me or my DH will pick him up and shhs until he is settled.
The problem is naps, since about 2 months old he just will not nap in the day. The longest nap he has ever had in his cot was 2 hours and I have no idea why; I did everything exactly the same as I always do for naps. The next day he got no nap sleep at all 
He used to nap really well in his pram or car seat so I would time journeys and walks to make sure he napped. Now he won't even sleep in the pram or car seat and if he does it's a short nap which he comes out of really sleepy. Now he won't even nap in the sling, which used to be guaranteed.
We have a naptime routine with wind down time about 1 hour 45 minutes after he's been up then taking him up when he's been awake for about 2 hours. Change nappy, sing lullaby, pull blackout blind and cuddles. Then shhs in our arms. Sometimes he will get dozy in our arms and we can put him into cot. Sometimes I need to feed him to get him dozy. No matter what we do he will wake up after only a few minutes sleep usually about 20 minutes (today he slept for about 5 minutes then woke up).
We're always on the lookout for sleepy signs and can see his yawns, eye rubs, grizzles so we know he's tired and needs a nap.
If he was fine and happy after only 20 minutes I would learn to live with it but he's not!! He just gets more and more tired as the day goes on and is cranky and miserable. The day he had the 2 hour nap he was the happiest most smily baby ever.
So....we need to help him nap and learn how to sleep properly and settle himself. Is CC suitable for naptimes? If so, how long do you do it for before giving up on that nap? If the baby cries for 1 hour do you give up and try it the next naptime or do you keep going and going (what if he doesn't fall asleep???)?
I'm sorry this is so long but I want to help him get the sleep he needs.