Green stool is very common and usually completely normal for babies drinking iron-fortified formulas like NAN 1. The iron in the formula, or normal digestion, often causes this green color. You do not need to change his formula or give him any medicine. As long as your baby is active, feeding well, gaining weight, and has no other symptoms?such as fever, vomiting, watery diarrhea, or blood in the stool?there is no cause for concern. However, if he shows any of these warning signs or seems in pain, please consult your pediatrician.

At 4 months, your baby?s main source of nutrition must remain Nan Pro 1 formula. Standard pediatric guidelines recommend waiting until 6 months to introduce solids. However, if your pediatrician advises starting now due to developmental readiness (like good head control), you can introduce smooth, single-ingredient purees (like mashed banana or pear). Start very slowly: offer only 1 to 2 teaspoons once a day, preferably after a formula feed. Introduce only one new food at a time, waiting 3 to 5 days to monitor for any allergic reactions. Always consult your pediatrician before starting solids.

At this age, continuing a standard infant formula like Nestle NAN Pro is usually appropriate for complete nutrition. To reduce gas, feed smaller amounts more frequently, use proper bottle techniques, and burp the baby regularly. Do not change foods or formulas on your own. Only switch to a specialised or comfort formula if advised by your paediatirican.