...how long were you able to that for?
My four month old naps exclusively in her carrier (and in her sling as newborn)
It works for us both as I'm on the go with DC1, so I have my hands free and it's very chilled for us both as once we've finished playing or whatever I pop her in at naptime and she looks around until she's ready to sleep. While in the carrier she generally sleeps through any noise or activity, whereas on the rare occasion she sleeps in car seat she wakes very easily.
I don't want to make any big changes yet as have a hospital stay with DC1 in a few weeks and DD2 is allowed to come with us, so it would be great to know I can continue for now and concentrate on DD1 - on the other hand I'm not sure how long she can really nap like this for? I suppose the carrier is up to 12 months so there's no reason she can't nap in it for a while yet, although eventually I'll need her to sleep in cot for naps I suppose