@guilhermesilva Totally normal to still be messing up pronouns at that age. Model the correct language and he will grow out of it . My 4.5 y/o still occasionally messes them up and he was literally just reviewed by a speech pathologist and they saw no issues with him (the kids are screened routinely at his school).
@guilhermesilva Just model the correct way of talking. (You’re already doing this naturally, I just mean don’t pick up his habit of switching the two and echo it back because it’s cute/silly.)
Don’t invite problems where there aren’t any or make your kid self-conscious. This is a very, very common mistake with young kids and your school is correct that it’s not an issue currently.