My son is 8 years old. He’s never had any trouble with his speech or development. I have noticed it a couple of times in the past where he will say things like ‘Thor’ instead of ‘four’ but over the last 6 months or so it’s become so much more prominent. So like falling is ‘thalling’ basically any word starting with f becomes th? I’ve asked him to say the words slowly and he can say it with an f no problem. It’s like when he’s rushing to tell me something it comes out as th? We had a go with ‘feather’ today and he said ‘theather’ then ‘theafer’ I just wondered if this is common as I’ve googled it and can’t find any answers? Or is it likely for kids to get these problems at this age and it will just pass? Thanks