Change in sleeping and feeding patterns at 4 months

My LO is 4 months old, he used to take 4-5 hour stretch during feedings at night which gave me a good rest, he didn't need to be rocked to sleep, I'd just lay him down in his crib with his dummy and stuffed toy bunny which he loves to hold and he would go to sleep on his own for all his day time naps and also at night.

But from last 3 days he is unable to sleep on his own and needs to be held/rocked plus he has started to wake up every 2 hours for night time feeds which makes me super tired in the morning, also he wakes up by every little noise and isn't having deep sleep like he used to...

Is this 4 month sleep resgression? Did anyone of your babies went back to their normal routine after this? I'm really worried that he will stick to this new routine.