Fighting daytime naps

My 6 week old has started to fight daytime naps. He is a good sleeper at night averaging 6-7hours of sleep but during the day he will fight going to sleep. He will feed and then I will change and swaddle him to put him down. He is tired and falls asleep but will not sleep longer then 30 minutes in his crib. Eventually he becomes overstimulated and cranky and the only option is for me to put him in his carrier or sleep on my chest. Anyone else experiencing this? Any advice?