Here’s the thing: spring water isn’t just “water.” It’s nature’s cocktail, complete with minerals like calcium, magnesium, and—dun dun dun—fluoride. Too much fluoride can cause white spots on your baby’s teeth, a condition called fluorosis. It’s not dangerous, but it’s a cosmetic thing, and nobody wants to be the parent who gave their kid tie-dye teeth.
So, check the label. Look for low fluoride or fluoride-free spring water. Most brands are fine, but some are mineral bombs. If the label lists “less than 0.7 mg/L” of fluoride, you’re golden. If it’s silent on the matter, assume it’s a wild card.