Feeding timing change after growth spurt

My baby was eating every 3-4 hours at night ( some days it was more spaced) since he was 2 weeks old. He had a growth spurt on week 5 and since then he wakes up every 2'5 hours at night to eat. It's been a week and he seems to have overcomed the spurt. He still eats every 3-4 hours during daytime, but not at night.

How can we get our old schedule back?

Why did it change?

Now he eats 7-8 times a day instead of 5-6. I feel we have taken a step back.

Thanks.