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
Coloboma Iris