My son is now 2 but when he was under a year old we had to give him 6ml’s of salt everyday.  So we would just give him 1 ml at at time in some milk.  He would drink it up.  As he got older his blood pressure was high so once he was a year old they told us to stop the salt and he would just naturally want to eat saltier foods so we just let him eat pickles ( he loves pickles) chips and other salty thinks... hope this might help some