Can you feed it to him if he’s intolerant? Isn’t that a life long thing, lactose intolerance? I thought it was, not 100% sure though

You can buy formulas that are not dairy.When you baby is older you can intoduce lactose
free cheese, yoghurt, cream, icecream and custard -(all available in supermarkets). Some never overcome lactose intolerance. I have 2 nieces who are lactose intolerant. If she accidentally has even the smallest amount and it gives her stomach cramps and severe vomitting, sometimes resulting in dehydration as she then doesn’t retains sips of water either.

My bubs was also dairy intolerant but to the extent it gave her such bad colic that i had to stop BF at 5 months and put her on prescription formula. In saying that though she outgrew it around 18 months and was able to tolerate yoghurt & cheese. She is 4 now and can tolerate small amounts of dairy (icecream is her favourite of course) but can’t have too much full cream milk. I have gone with giving her rice milk or almond milk as a drink and dont worry too much as she is getting the calcium from other sources.
Hope this helps