Swallow food

I have been feeding my 19 months old baby porridge all the while... And i would blend or mashed his food(e.g banana or potatoes etc). So i realized he would have difficulty swallowing his food if the food is not blended or mashed. He is currently in childcare and they are serving rice with fish or chicken and a slice of fruit (eg. watermelon). He would then chew and threw out but not swallowing it. Im very concern, what should i do??