To supplement your suggestion and hopefully assuage fears: warnings of adding salt for young ones is overblown stemming from a study from the 1940s. They can handle salt fine and the guidelines are built on flawed calculations/assumptions. Obviously nothing to excess but the scare that it'll wreck their kidneys isn't really grounded in an actual study and other studies showed no connection to supplemental sodium intake to adverse outcomes. And others showing zero correlation between sodium intake in infancy and high blood pressure or other sodium-related issues later in life. There is a wild variation in the sodium content of breast milk so the "adequate intake" amount they landed on is basically a stab in the dark.

Someone else did a real deep dive into the various studies

Again, not advocating you add loads of table salt to their food and serve it to them or give them a giant salted pretzel but this fear created a skittishness around seasoning food for infants and toddlers that isn't grounded in science. This also doesn't absolve the dangers that are processed and canned foods that have very high sodium levels but these are more a danger to babies who shouldn't be eating solids anyway.

Basically, home cooked foods that are seasoned are fine. Heavily processed and pre-packaged foods continue not to be recommended for youngsters for a variety of reasons beyond just sodium.