H.1.
This is totally normal. If it starts seeming like he's missing that hour of sleep he's used to getting, as counter intuitive as it seems, put him to bed earlier. Around 6 months old, we started doing this with my son - moved from a 7:30 bedtime to a 6:45 or 7:00 bedtime because he was waking up earlier, but still needed the total number hours of sleep he was used to. In fact, even at 16 months old we still put him to bed extra early (6pm at times) if he's starting to lose sleep on early wake ups or missed naps. He ALWAYS sleeps at least until his normal time after going to bed early and usually sleeps even later. My advice is move his schedule up a bit to around 7:00 or 7:30 pm and see how this affects his wakeup time. Even if it remains 7am - at least he's getting more sleep like he needs.