My 9 month old started to wake earlier in the mornings!?

My son was sleeping through the night for couple of months now from 8pm -7am (give and take about 5 min). He started to wake earlier for about a week now. First it was around 6:50am, then 6:40am and today he woke at 6:15am! This is driving me crazy because I don`t know if I should cut out one of his naps because he might just need less sleep at this age. He is 9 and1/2 month old exactly. Also, he is teething for many many weeks now but no teeth yet. He is babbling in his crib, `talks` to himself or bang on the crib rails (he does that a lot before he goes to sleep during the day), never cries so I don`t think he wakes because he is in teething pain. Last night he fell asleep at 8:15-20ish and woke this morning even earlier then ever. He uses his pacifier, he can find them, I keep two in his crib. Also, he has two naps a day, each about 1 1/2 hrs long. Please give me some advice or is this going to p soon?