My 9 week old won't nap during the day unless he is in his car seat! He sleeps well during the night time he goes down in his crib no problem at 9pm and he even goes down awake sometimes and falls asleep on his own. He sleeps until about 2am then has a bottle and goes straight back down no problems until 7am then has another bottle and goes back down until 9.30/10am.
But during the daytime he just fights sleep and will only nap if we go out in the car where he will fall asleep straight away and stay asleep for the duration of when we are out. Sometimes he will fall asleep in his bouncer or swing for a short time maybe 30mins but then is wide awake again. He's been grizzly thismorning as he hasn't napped so I put him in the bouncer and rocked him, nope didn't work he got himself worked up crying, just out of interest I've put him in his car seat and it's like magic straight away he is asleep 
So my question is at this age do I just go with the flow for now? And let him nap where he will for now or should I be trying to put him down in his crib in the daytime? I don't want any of this rod for your own back stuff 
But then I'm not sure if it's too early to establish a proper daytime nap routine?