I have this issue too. I have a 19 month old who I refer to as my little handful lol. He usually wakes up earlier than the rest and some days his chattering wakes the others. Today was one of those days. He was soooo loud and ended up waking up the 15 month old and the 2 older boys (3 and almost 4 years) a whole hour early!! I left him in his playpen which was a mistake. The poor 15 month old fell asleep in my arms outside after snack. He was so cranky from not getting his full 2 hour nap and I am transitioning him out of morning naps so he was extra tired!! So annoying when the chatter wakes them up!

I have no advice lol. In hindsight, I should have just gotten him up and outta his playpen when I saw on the monitor he was awake. I selfishly wanted a longer break though He very very very rarely falls back asleep and I know this. Good thing he's part time lol