It doesn't sound like colic. Colic is much more persistent. It could be his "fussy time" - is he doing it in the evening, or in the middle of the night?
If it's afternoon/evening, it might be something he's eating. Have you started solids? If you're nursing, is there something new you've been eating for the past few days?
If he's doing it in the middle of the night, it could be just a normal part of his sleep cycle. I learned after a while with both of my kids (3 1/2 and 16mo) that they had phases of light sleep where they'd cry or fuss for 5 or 10 minutes in the middle of the night. Once I realized this, I quit going in to mess with them. It still happens with my 16 mo old most nights at 11pm and 3am (thought it's now about a 2 minute interruption). We can almost set the clock by it.