I'm Welsh and my DH is from Newcastle with Yorkshire parents. We both have no accent but say bath, castle and glass (among other examples) with a hard 'a' like in apple, like our parents do. Our DS (3.5) says those kinds of words with a soft 'a' like in farce. I swear it's from watching Peppa Pig who says grass etc with a soft 'a'!
Do you think he'll grow out of it and end up talking like us? I don't mind really. Just interested to hear what you all think :)