Sleep tips for a 4 month?

Owen started sleeping through the night the day he turned 3 months.  That day was amazing because I slept like a brick and woke up frantic as I looked at the clock and it was two hours after his normal 4am wake up time.  I have a monitor by my bed and saw he was ok and relief came over me... "he slept through the night!"
Well, let's fast forward to now.  This will be the fourth week that he's been waking up several times during the night, his favorite time is the 4am hour and he'll always need to eat. Doesn't matter when he goes to bed, 10pm, 12am... he will wake up in the 4 am hour to feed and won't go to bed unless he eats.  I know that's not terrible because sometimes that's 6 hours, but now it's been three times a night (around midnight, 4am, then 6am then up by 9am).
Any tips to help him sleep, hopefully this is a quick phase even though it's been a month right?  I don't think he's sick but I guess teething always is an option.