“…However, it was revealed later that the clinical picture of retardation is not a uniform syndrome, taking into account its etiology, clinical picture and prognosis (Bakketeig, 1998, Battaglia and Lubchenco, 1967, Deorari et al, 2001, Doszpod, 2000, Golde, 1989, Gruenwald, 1963, 1966, Henriksen, 1999, Kurjak et al, 1978, Kramer et al, 1990, Lin et al, 1991, Lin, 1998, Rosso & Winick, 1974, Senterre, 1989, Wollmann, 1998. As a basic requirement, one has to be able to differentiate between proportionally and disproportionally retarded newborn babies.…”