Yes. Very much so. Youngest had trouble sleeping and feeding, would cramp herself up in pain and struggled settling pretty much from birth. We were prescribed ranitidine for silent reflux which did help. She also had little spots and rashes over her though, and problems after certain foods so we considered various intolerances. Which I never considered, I thought such things were just in the minds of paranoid parents. My girlfriend cut various things out of her diet as it would come through her breastmilk - in the end soya, eggs and dairy were off the menu for both. It can drive you crazy, we had food diaries and were ditching beef, fish and peas for a time too. Soya is an odd one, I think it is structurally quite close to lactose and it finds its way bloody everywhere. Most breads seem to have some lingering in there.
We went onto various formulas, some had denaturalised lactose in them (or something), I do remember Nutramigen being particularly vile. It looked and smelled like Campbell's mushroom soup, she wouldn't touch the stuff. We settled on Neocate. Almost like magic this stuff, took a while to get used to (mixed half and half with her usual stuff) but it seems to act just like "real" formula and is free on prescription Seemed to sort her right out that, as well as cutting out dairy, eggs and soya. Not as challenging as you'd think, even using pots rather than cooking from scratch. Oat milk was the best plant milk for general use, violife vaguely OK for spreadable cheese. So, so many bad fake cheeses. Chocolates ditto. I'd focus less on replacements to be honest and just revise the whole menu or you will spend your life paying £5 for some grim as fuck cheese free pesto.