My DD did that. It started when she was 6 months old. It happened right after we moved so we thought it was just the climate change. Then she did it in her sleep and we got qorried. DH has sleep apnea so we thought she might too. It stopped and I noticed today (she's 10 months now) that she has done it a couple times. I think your babe is ok. Keep an eye on him to be safe but I bet here shortly he stops doing it.
It's scary huh!
