Sleep regression and feedings?

My 3 1/2mo was sleepy so well through the night (3.5 to 5.5 hours stretch). A few weeks ago he started waking up more often (1.5h to 2.5 h between feeds). Now he wants to feed everytime he wakes. He moves so much he cannot stay in his swaddle anymore. When he is swaddled he sleeps the usual longer stretches.

I don't know if I should be trying to soothe him without feeding him every time. He doesn't need to feed to sleep during the day. I would love to hear what some of you have done. And if you used sleep training, what philosophy did you use?