my son has sleep apnea?

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since he was a baby, I observe he breathe heavily and noisy. Now he is 8 years old, it never change. Sometimes I just look at him when he is asleep because it seem he stop breathing for seconds, he gasps for it and sound asleep again. Whenever we go for doctor check up,they notice his tonsil is large than the regular. I searched about it online. That for most cases like this, a tonsil removal is being done. Of all the pediatrician who checked him, no one suggested his tonsil to be removed. I wander. I ask my son if he has hard time breathing but said no. I also notice he breathes with the help from his mouth. Any evaluation? Thank you.