Background: Placental insufficienty with fetal intrauterine growth restriction (IUGR) is an important cause of perinatal morbidity and mortality and may also be associated with significant neurodevelopmental impairment. Biamniotic bichorial twins could be a good example to prove this, if the main reason of the IUGR of one of the twins is due to placental insufficienty. Material and method: We studied the twins psychomotoric evolution with Bayley Infant Neurological Screener for 10 months. One of them was AGA, the other SGA. Semnificative differences were found in mean velocities and end-diastolic velocities between the two babies, and hypoglycemia of the second baby. Results: BINS showed the differences of the twins’ psychomotor evolution, but in the tenth month of testing they looked small compared to the results from the third month. Conclusions: IUGR is a frequent cause of neorodevelopmental problems of different degrees, and also of hypoglycemia. Low vascular resistancies in the first days of life can be the first sign of IUGR. It is important the follow up of infants with neurological risc for the precocious identification and recuperation.