How long to wait between trying baby on different foods?

So I was told 4 days in between new foods to see if a reaction occurs. I was doing this and then I hear of baby led weaning. I have nothing against baby led weaning, I was interested in seeing what it was so I joined a group on Facebook, and I’ve noticed that babies are being fed more than one type of food at once. So baby led weaning isn’t for me (just purées are going great and we’ve been doing this now for a bit) SOO do I HAVE to wait 4 days in between different purées? I understand waiting after a high allergen food, like fish or if there’s an allergy in the family. But something like bananas, I feel like if theres no sign of an allergy after a couple days it should be fine 🤷🏻‍♀️IDK give me your thoughts pls! We got the go ahead to basically give anything and there’s so many foods I want him to try but this 4 day wait is killing me lol.