Kokushibo got turned into a child and no one told Muzan until a few days after the incident happened/occurred

Akaza(uppermoon 3):"Lord Muzan Lord Kokushibo turned into a child..."

Daki(uppermoon 6):"..."

Gyutaro(uppermoon 6):"..."

Douma(uppermoon 2):"Lord Kokushibo looks so cute~!!"

Muzan:"WHY DID NONE OF YOU TELL ME TILL NOW?!"

Nakime(uppermoon 4):"..."