4 month sleep regression

Can we do anything to help with this? Should we start sleep training or will his old sleeping habits go back to what they were? I feel like it’s a little early to sleep train but we aren’t sure what to do. Our baby boy has been sleeping through the night but the past 2 weeks has been waking up 2-3 times in the middle of the night. We don’t use the pacifier often but have been during this time because we are just so exhausted and will wake up fussy. Any tips or tricks?