Quintero stages A staging system is commonly used to classify the severity of<unk> . Stage I: A small amount of amniotic fluid (oligohydramnios) is found around the donor<unk>  and a large amount of amniotic fluid (polyhydramnios) is found around the recipient<unk> . Stage II: In addition to the description above, the ultrasound is not able to identify the bladder in the donor<unk> . Stage III: In addition to the characteristics of Stages I and II, there is abnormal blood flow in the umbilical cords of the<unk> s. Stage IV: In addition to all of the above findings, the recipient<unk>  has swelling under the skin and appears to be experiencing heart failure (fetal hydrops). Stage V: In addition to all of the above findings, one of the<unk> s has died. This can happen to either<unk> . The risk to either the donor or the recipient is roughly equal & is quite high in Stage II or higher<unk> . The Quintero staging does not provide information about prognosis, and other staging systems have been proposed.
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