HELP. best sleeper turned terrible sleeper

You guys I'm dyin here. My baby was the BEST sleeper, until about 2-3 weeks ago. He's been waking up almost 4-5 hours after he goes down for the night and acts like he's starving. He's 4 months now. Do you feed him when he wakes up? Is it bad to feed him? He used to sleep fine through the night so I have no idea what to do. I don't want to start any habits, but if I should be feeding him I want to. He's been eating 7oz about every 3 hours during the day. He's a very active baby. So he eats a lot. Do you let them cry it out when they wake up in the middle of the night or feed him? I'm at a loss at what to do. Is this a sleep regression? How do you know? First time mom here. 

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