DS is almost 11 months old, and in the past week his day sleeps have changed a bit.

DS usually has 2 day sleeps of 1.5-2 hours each, and is generally awake 3-3.5 hour betwee sleeps. However, just recently he has started waking after a short amount of time for his first day sleep. A few times it has been only 5-10 mins, this morning he slept 20 mins before waking. He awakes happy, though still tired. I've tried resettling him, but he refused to sleep again until an hour or two later. When he goes to sleep then, he'll usually sleep for 2-3 hours. By the time he wakes up, it seems pointless to try and get an extra sleep out pof him, cause he'd be going down around 5pm - seems to make more sense just to try and get him to bed early for the night.

It isn't every day, but it has been happening a bit just recently. Is this the start of him transitioning to one day sleep?