2 pairs of shorts 1 pair of swim trunks 0-3

I have three pairs of brand new boy shorts 2 regular and the fish pair are swim trunks I bought them for my son and he never got to wear them, I had him in june and 0-3 were way too big for him he's 5 months old and just now into 0-3 they are all different brands see pictures for details I took the tags off so I could wash them to see I they would shrink