13 month old waking too early

So i have a 13 month old and previously his sleep schedule was

Wake-5am Nap 1- 9-10am Nap 2- 2-3pm Bedtime 6:30pm

Now iv adjusted his bed time to 7pm but he is still waking between 5-5:40

I want him to wakeup between 6-7pm what can I do to adjust his bedtime?