Supplement help!

Rachel β€’ Two angel babies in heaven πŸ’• Rainbow baby boy born September 2017 πŸ’™πŸŒˆ

I have been EBF my seven week old the entire time and things have been going really well up until about two days ago and it seems that he is going through a growth spurt and is eating a lot more and my body can’t seem to keep up. I am doing what I can to try to increase my supply but I think I may have to break down soon and use formula to supplement. I’m looking for suggestions from moms that breastfeed and use formula on which is best because I have no idea about anything formula related?