Pediatricians and formula makers recommend using distilled water for baby formula because it is clean and free of possible contaminants like lead, pesticides, bacteria, viruses, nitrates, and more. The damage from ingesting these toxins can lead to lifelong health problems, or in extreme cases, death.
To lessen this chance, parents can use low-fluoride bottled water some of the time to mix infant formula; these bottled waters are labeled as de-ionized, purified, demineralized, or distilled, and without any fluoride added after purification treatment.