Why is the sleeping changing now

Hi mommies! My son is 6 months old i had his sleep routine and nap time, timed perfectly just like clock work.

Now the past week almost its been a struggle to get him to take any naps and when he does its maybe 20 mins each time. Now its been rough to get him to go to bed he will fall asleep around 930ish stay asleep for about 30 mins and then stay up till just after 130 and then wakes up at 430 to eat a bottle then falls asleep. Then wakes up after 6ish eats then wakes me up around 9.

Is this normal? Is it a growth spurt? He already has 2 teeth now. But im not sure if its a growth spurt or maybe teething?

Do any of you moms have any tips? Thank you so much.