The following is not a feature of Pierre – Robin syndrome –
Pierre Robin syndrome consists of -

Micrognathia
The foreshortened floor of mouth
CHDs
Cleft palate or high arched palate
Mandibular hypoplasia (Micrognathia) 
Respiratory obstruction
Normal size tongue
Hearing defect
Coloboma Iris
Respiratory distress
Mandibular hypoplasia