I know newborns have a really unpredictable breathing pattern but my DS is 17 months so should be beyond that. He's not a great sleeper. He wakes up crying every hour or so during the evening, then has an unsettled patch before midnight that can last an hour or more, and wakes up through the rest of the night a couple of times usually, for a few minutes or two hours. 
I have noticed while holding him (before putting him back down) his breathing stops for up to ten seconds before he take a great gasp of air. Sometimes it wakes him up again. Sometimes he cries in his sleep afterwards. He'll take three breaths and then just stop. It is really upsetting me but I don't know whether to take him to the GP or not. I know sleep apnea is rare in children, but he does snore a lot and the waking up suggests that something disturbs his sleep. Thoughts? Anyone?