Meconium peritonitis is a medical condition that occurs when a baby's bowel movement, or meconium, leaks into the abdomen and causes inflammation. There are several synonyms for this condition including meconium ileus, meconium pseudocyst, intrauterine meconium peritonitis, and in-utero meconium peritonitis. These terms basically refer to the same condition, but may be used depending on the specific circumstances of the case. Meconium peritonitis is a rare condition that can be caused by a variety of factors including maternal infection, blockage of the infant's bowels, or premature rupture of membranes. It is important for parents and medical professionals to be aware of the signs and symptoms of meconium peritonitis in order to ensure timely and effective treatment.