6 months. Just no added salt or sugar light pepper or anything actually spicy
As soon as we started weaning. Was mostly paprika and black pepper at first. He's now 21m and I don't modify our dishes anymore. He has whatever were eating with the same amount of spices as us.
We did the first week weaning of plain foods but since then he's had all sorts of herbs and spices just no salt of course. We had 1 terrible nappy after his first taste of chili but everything else has gone down a treat
Straight away(from 6ish months old).We just don't put salt in.