How old is your DS? Does it lie flat? My DD is 6m old and can be a nightmare getting to sleep in the day so I often take her out for a walk in her pram and once she's asleep I leave her in it at home until she wakes, it does lie completely flat and is suitable for a newborn
My DS only naps in his pram or in the car. Pram naps are great. We go for a walk, and five minutes after he falls asleep I get back home and park him in the hallway and often I can get on with stuff or faff around on the internet with a cuppa. Also if you need to go to the shops or anything then a pram nap is ideal. My DS is 12 months now and still only does buggy naps. He used to do sling naps too. I can't be bothered getting him to nap in the cot - it's a job enough getting him to sleep there at night.