More commonly, babies pass their first meconium stool prior to birth resulting in meconium staining. (verywellfamily.com)
The majority of babies will have meconium stools within the first day of life, which slowly become less tarry and thick over the first week of life. (verywellfamily.com)
Because many new parents aren't ready for the large, black, tarry meconium stools that newborn babies have for their first few days. (verywellfamily.com)