Actually Meconium is the earliest stools of an infant. Unlike later feces, meconium is composed of materials ingested during the time the infant spends in the uterus: intestinal epithelial cells, lanugo, mucus, amniotic fluid, bile, and water. Meconium is almost sterile, unlike later feces, is viscous and sticky like tar, and has no odor. It should be completely passed by the end of the first few days of postpartum life, with the stools progressing toward yellow (digested milk). (wikipedia)
According to pregnancy.com "Meconium is a thick, green, tar like substance that lines your baby's intestines during pregnancy. Typically this substance is not release in your baby's bowel movements until after birth" .
they also said that it can take a few days to get all out. If baby is over a week and still pooping "tar" ask your Dr.
at 8:44 PM on Jan. 15, 2010