11 week old not sleeping

My 11 week old son used to wake 2-3 times at night to eat and would go back to sleep easily. He’d typically do 3-4 hours, then 1-2, then 1-2.

For the past 10 days, the longest he’s slept at one time is 1.5 hours. Majority of the time he’s waking 45 minutes after I lay him down. He’s also waking up crying, where before he’d just be restless and making noises.

I heard about the 4 month sleep regression but not sure if it’s too early for that to be what we’re experiencing. Has anybody else dealt with something similar? Any advice for getting through it? Thank you!!