This is usually a sign to size up.. Kit&Kin sizes are not very accurate for us but are absolutely the best so definitely recommend sizing up and seeing whether is helps :)
Get some cloth diaper covers and put that over whatever disposable you decide to use (even if you size up) As a mum that used cloth diapers fulltime I did not even clean up one blowout- his poo never came out of the diaper onto his clothes. This is also the reason why they tell you to “double up” and use a reusable diaper over the disposable for swimming- reusables have real elastics, it keeps all the poop in. Just put a cover on top and it’ll contain it all. Plus they’re cute. So act as bloomers under dresses.
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If you’re getting a blow out every day i would definitely try sizing up and seeing how it goes, the weight it just a rough guide, I always found a size up worked best for my lo x