Sma first infant hungry milk

Hello everyone! My baby boy is 1 month old and taking 9-11 feeds a day of an average of 4-5oz. I haven't had him weighed in a couple of weeks but based on his last weight he's up to 12 pounds. He wakes every 1.5-2.5 hours at night for feeds and can usually (if we're lucky!) go about 3 hours during the day. So we have our hands full! He's hungry all the time but won't take more than 5 oz but then is hungry again shortly after. He's on sma first infant milk but I am really thinking about moving him to sma first infant hungry milk. I don't want to make him sick though! He's never had tummy trouble and is good for getting wind up so he might be ok? Does anyone have any advice? Will it be worth putting him on hungry milk? He feeds so much!