Not sleeping through the night anymore 😩

Gabbie • Mother of 4

Hey ladies, my son has been sleeping through the night since he was 2 months. And over the last week or two he has started back waking up in the middle of the night. I feel like i felt in the very beginning. The last 2 nights it was like 3-4 times. What is going on? He just turned 6 months last week. Anyone having this issue?