Night feedings

So my LO started waking up at 12-1am this past week. The only thing that would get him to go back to sleep was a feed. So I started giving him 2 oz of formula (he's formula fed). I wake up at 5am for work so I feed him then too and put him back down for sleep. He was starving last night at 1am and guzzled down 4 oz ... Did I create a bad habit? What are you mommas doing about this sleep regression? Is this just something were gonna have to let ride for the next month or so? He used to be sleeping solid from 730-5am. I'm tired, he's 16.5 weeks... 😩 Someone send halp... ?!