Hello, I understand your concern
Dark green or brown-colored stools in a healthy, active 16-month-old on formula feeds are usually normal and not a cause for concern.
Offer iron-rich foods from natural sources as the baby transitions to family diet.
Avoid over-reliance on formula after 1 year—gradually shift to full meals and regular milk (cow/buffalo milk up to 400–500 ml/day).
Next Steps
Continue regular diet (with formula, solids, water).
Observe stool frequency and consistency: Soft, formed, or pasty stools are normal.
No need for stool tests if: No diarrhea, mucus, foul smell; No blood, fever, vomiting, or weight loss
Health Tips
Red flags:
Persistent loose stools or mucus
Blood in stools
Poor appetite or weight loss
Baby becomes dull or irritable