Hi moms. So I'm not making enough milk to keep my son satisfied :(

He's hungry every hour all day and night and eats between 2 and 4 oz when I've pumped and can see how much he's getting. I guess there aren't enough nutrients in it? So I want to start supplementing with formula during the day and breastfeed at night.

What formulas are best for combination feeding? I know all babies are diff but so far I've seen enfamil gives a lot of babies gas. Please, constructive comments only. I don't need anyone griping at me about "breast is best", I know that but I just can't keep up and I need to keep him fed and me sane!