Gentlease to Up & Up hypoallergenic

My little guy will be 6 months on the 25th. He’s always been gassy/acid reflux. He has been eating baby food and baby oatmeal since he was 4 1/2 months old 3 times a day. Over the past 2 weeks, he has been super gassy. No drops help. I’m considering switching to nutramigen, but the target brand. Think that’ll help? He has never slept through the night, but has been a lot more fussy and clingy at night now. I just want to help him be comfortable and sleep through the night. I’ve also stopped oatmeal at one feeding. Thanks :)