some children just like adults need diferent amounts of sleep and have different sleep patterns, it's been a long time since i had to deal with this personally, my baby is now 4 but i babysit and have a 13 month old little girl here every day that i have had since 6 weeks old. she will nap from 1-3 here for me most days nad be perfectly happy, at home she naps in 45 minute spurts 3 times a day, morning afternoon and evening, she is a rock me to sleep baby and does not put ehrself to sleep, aso with the other kids in the house and all the activity i don't have any trouble keeping her up most days, so she will sleep for a longer stretch here, i do notice though that she wakes up about halfway through and i have to rock her back to sleep, she is still so tired having missed her morning nap but her body says hey you've been asleep long enough wake up, you could try keeping him busy and seeing if he will skip that nap, part of it is habit for both of you, otherwise i think you said it, he's happy, leave it be untill it interferes with yur schedual or he isn't. good luck. oh and it jsut occured to me part of why children start taking fewer naps is because of how active they are, if he isn't crawling and getting around yet it could just be a developmental milestone he isn't ready for.