Ok I have a question about diapers. I am not sure how my baby weighs but he is around 22-23 pounds.…

Ok I have a question about diapers. I am not sure how my baby weighs but he is around 22-23 pounds. A friend of mine caught my attention and she saw when I was using a size 3 diaper on him and it says it looks to tight but size 4 is a little bit big. I tried the brand little journey and luvs in size 4 and I feel there a little big so I read to try another brand and I was thinking of trying size 4 in pampers what do you guys think ?? How do you guys know when it's time to change the size up in diapers??