Its arrival is a good early sign the gut is working. Over the first week, stools change from meconium to greenish 'transitional' stools and then to the yellow, seedy stools of a milk-fed baby. Tracking those early nappies is a handy check that feeding is getting established.
Glossary
Meconium
Meconium is a newborn's first stool — sticky, greenish-black and tar-like — made of everything ingested in the womb, usually passed within the first day or two.
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General information, not medical advice. For concerns about your child, talk with your doctor or child-health nurse.