2 year old with possible sleep apnea

I have noticed when my 2.5 year old is sleeping, he will take a deep breath in and then have a pause in breathing for about 10 seconds. This is not an every night things. But tonight I've noticed it 2 times in the past hour. Could it possibly be sleep apnea? The only thing is he does not snore, wouldn't say he's a restless sleeper, and doesn't always breathe through his mouth. It is making me a littler nervous.