Bruises on diaper fold ? On hips

FirstTimeMom💁🏻🤰🏻🤱🏻

I noticed LO has tiny bruises where you tie the diaper - it got better after I started putting the diaper looser but I don’t want poop and pee everywhere! He is more active now and it looks like the tabs are tighter only when he sits up. Any tips ? Anyone else get these ?

He’s 21 pounds and we are in Huggies movers size 4🤔just bought a size 5 box but we are still well within the size 4 weight- am I just terrible diaper changer😰you would think after over 9 mo and 24 hour diapering I would know how to do this 😔