Is the sentence fine?

All the children are each entitled to an ice cream.

The second definite article is wrong, and you have the correct indefinite article.

This might be better, but the sentence as i have it above works just fine:

All of the children are each entitled to an ice cream.

Finally, the simplest would be:

All the children are entitled to an ice cream.

Native speakers would understand that one ffor each of them is implied.

Each child is entitled to an ice cream.


Here we would say how the ice cream is served, i.e. ice cream cone, ice cream sundae, ice cream float, ice cream bowl. We don't really have "an ice cream", but I understand that may be a concept used in other countries.

We do in the UK, usually it means a cornet, but could mean any ice cream.

all children are entitled to the ice cream

Context is vital to determining what is natural and unnatural, Ms Tan.

As a normal neutral lead statement, it's a bit much but still possible. Used as an emphatic response to a previous statement, it would work.

All the children are each entitled to ice cream.

All the children are each entitled to an ice cream.

All of the children are each entitled to an ice cream. Put preposition