<unk>  <unk> , also known as feto-fetal<unk>  syndrome (FFTS),<unk>  oligohydramnios-polyhydramnios sequence (TOPS) and stuck<unk>  syndrome, is a complication of monochorionic multiple pregnancies (the most common form of identical<unk>  pregnancy) in which there is disproportionate blood supply between the fetuses. This leads to unequal levels of amniotic fluid between each fetus and usually leads to death of the undersupplied<unk>  and, without treatment, usually death or a range of birth defects or disabilities for a surviving<unk> , such as underdeveloped, damaged or missing limbs, digits or organs (including the brain), especially cerebral palsy. The condition occurs when the vein–artery connections within the fetuses' shared placenta allow the blood flow between each fetus to become progressively imbalanced. It usually develops between week 16 and 25 of pregnancy, during peak placental growth. The cause of the developmental effects on a surviving fetus may include necrotic embolisms from a dead fetus, low blood volume due to pooling in the dead fetus or velamentous cord insertion (insertion of the umbilical cord into the chorioamniotic membranes). The primary treatment of<unk>  is fetoscopy and laser ablation of the interconnecting blood vessels to cut off the exchange of blood between the fetuses. This treatment is associated with an 85% survival rate of at least one fetus. Other treatments include periodic removal of amniotic fluid (serial amniocentesis), which is associated with a 66% survival rate of at least one fetus. Without treatment, there is an almost 100% mortality rate of one or all fetuses. Even with treatment, the condition is associated with premature birth and a risk of cerebral palsy in a surviving fetus. Around 5–15% of identical<unk>  fetuses will go on to develop<unk> . The condition was first described by German obstetrician Friedrich Schatz in 1875.
Twin-to-twin transfusion syndrome
Neonatal meningitis
Hemolytic disease of the newborn
Hemolytic disease of the newborn 
Shaken baby syndrome
Neonatal toxic shock-like exanthematous disease
Michelin tire baby syndrome
Neonatal sepsis