My 4 mth baby wakes every 2 hrs at night.Is this a sign of Acid Reflux

He goes to bed wide awake (9pm) and soothes himself to sleep (he never cries). Then he wakes up at 230am for a feed (exclusively breastfed) and goes right back to sleep. Then he wakes up at 4am and 6am and insists on the breasts but only sucking for 1-2 minutes and then falls asleep. He then wakes up for the day (consistently) at 7-7:30. What can I do to stop the 4 and 6am wake ups? is this a sign of Acid Reflux?

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