Organic Formulas? US/European?

Eileen

Hello! I am now researching switching my little guy to organic formulas. He’s currently on Similac Pro Sensitive and crying between and after feedings. Also seems extremely uncomfortable trying to pass gas.

Some ladies suggest Holle or HiPP formulas. Has anyone used these and what has your experience been/best websites to get them for cheaper?

Any US organic formulas you might suggest as well for tummy issues?