Lactose intolerant?

If he were lactose intollerant, you would have known the first week.  The symptoms would have been severe and he wouldn't be growing.

Does dad have congenital LI or primary LI?   Was he born with it, or did it develop later on?

Dairy-protein intollerance is a bigger concern for babies... with that he may not have symptoms now, but it may cause issues down the road.  

Do you *want* to be supplementing?

If he were lactose intolerant, you'd have known by now. :-) 

Pretty sure dad was born with it and so was his dad. I didn't really want to supplement but my busy lifestyle with work demands lots of bottles prepared and I can't pump enough for what he needs. I did breastfeed the first month but now he was having problems latching which we are going in next week to look at toungue tied. It frustrates him to try to breastfeed and it broke my heart seeing him struggle so much so I pump

Quoting SewingMamaLele:

If he were lactose intollerant, you would have known the first week.  The symptoms would have been severe and he wouldn't be growing.

Does dad have congenital LI or primary LI?   Was he born with it, or did it develop later on?

Dairy-protein intollerance is a bigger concern for babies... with that he may not have symptoms now, but it may cause issues down the road.  

Do you *want* to be supplementing?

not necessarily...it's actually quite uncommon for an infant to be lactose intolerant (seeing as that's what breastmilk mostly is), but as you age your body produces less of the chemicals that break down lactose so you may still become lactose intollerant as you age.

Babies are not lactose intollerant because human milk is really high in lactose (unless they have galactosemia which is really rare and serious, and they have to be on prescription formula). A certain percentage of humand lose their ability to digest lactose in early childhood. So, it is possible that he could develop lactose intollerance when he gets older.

 You know know by now : )

I agree, you would know by now :)