baby sleeping less at night?

Allison • Wifey to 👨🏼‍🦲, mommy to 💙👦🏻, ivf warrior 💉, 🌈 baby 💙👶🏻
I am very lucky, my son has been sleeping through the night since 4 months (8-7). Last month he started waking more at 6:30, mostly because we started getting him up around 6:45 for daycare. The past 2 weeks he has been getting up earlier and earlier in the morning, 6 sometimes and 5:30 sometimes. We usually let him squirm a little to see if he goes back to sleep and he doesn't. He won't use a paci and he seems to have forgotten (or just doesn't want to) suck on his hands for comfort. 
Any suggestions how to expand his time sleeping? I am assuming it is a phase (maybe) and hopefully he will go back to sleeping 11 hours once the summer rolls around and I don't have to get him to daycare everyday.