A  child has been brought to OPD with mental retardation. On examination, microcephaly, triangular face, fifth finger clinodactyly is found. What is the most probable diagnosis
Features of Russel Silver Syndrome

Triangular face
Microcephaly
Short stature
Low birth weight
Fifth finger clinodactyly.
Russel Silver Syndrome
Angelman Syndrome
Treacher Collin Syndrome
Pierre - Robin Syndrome