After months of waking up at 4 or 5 am, we accidentally sleep trained Charlie one morning... which is a fancy way of saying, one morning he started crying and we were too tired to get him!
In any case, it worked out beautifully: he went back to bed after 25 minutes or so and then he woke up at 7 am! And he's been waking up at 7/7:30 am ever since!
What time does your little bundle of sunshine wake up in the mornings?