How many months old should an infant be to consume OS-1?

If an infant is drinking mother’s milk or formula, he or she should be able to consume OS-1, but we recommend that you consult a physician about using OS-1.
The “Guidelines for Managing Acute Gastroenteritis Among Children” of the US Centers for Disease Control and Prevention (CDC) contain the following recommendations.

Indications for medical evaluation of children with acute diarrhea

• Young age (aged <6 months or weight <8 kg)
• History of premature birth, chronic medical conditions, or concurrent illness
• Fever ≥38°C for infants aged <3 months or ≥39°C for children aged 3 to 36 months
• Visible blood in stool
• High output, including frequent and substantial volumes of diarrhea
• Persistent vomiting
• Caregiver’s report consistent with dehydration (e.g., sunken eye or decreased tears, dry mucous membranes, or decreased urine output)
• Change in mental status (e.g., irritability, apathy, or lethargy)
• Suboptimal response to oral rehydration therapy already administered or inability of the caregiver to administer oral rehydration therapy