Tammy HSherry,
I have a 4 month old SWCAH son that is also on salt. When he was breastfed strictly I would just put some salt on my finger and wipe it on the inside of his mouth. I didn’t measure it. I just gave him as much as I could whenever we were in the kitchen. I also tried the mixing it with some breastmilk but he spit that up most times because it was so strong. My Endo told me to just get the salt in him any way I can.
Good Luck
Tammy