7 month old keeps waking up at 6am after vacation

We went on vacation and he started getting up at 6am there despite my best efforts to mimic home. We've been home for a week and he's STILL waking up at 6am regardless of bedtime. I've tried keeping him in the crib until 7am, I don't turn any lights on, sound machine still on, no talking. Changed bedtime but it doesn't matter. 7, 7:15, 7:30 (normal time),7:45, 8pm. He's also been pooping in his sleep around this time too, which is something he never did before. How do I get the regular wakeup back around 7-7:30am? These 6am mornings SUUUUCCCKKKK...