Size Script To Increase Players Size Not Working?

I don't understand why my player won't grow in size even though there are no errors, and everything looks fine?

script in ServerScriptService

while wait(.5) do
	local children = game.Players:GetChildren()
	for i = 1, #children do
		if children[i].Character ~= nil then
		local hum = children[i].Character.Humanoid
		--hum.HeadScale.Value = children[i].leaderstats.Fat.Value/50 +1
		hum.BodyHeightScale.Value = children[i].leaderstats.Fat.Value/50 +1
		hum.BodyWidthScale.Value = children[i].leaderstats.Fat.Value/50 +1
		hum.BodyDepthScale.Value = children[i].leaderstats.Fat.Value/50 +1
		hum.WalkSpeed = children[i].leaderstats.Fat.Value/3.12
		hum.JumpPower = children[i].leaderstats.Fat.Value
		hum.MaxHealth = children[i].leaderstats.Fat.Value+25
		end
	end
end

leaderstats

game.Players.PlayerAdded:Connect(function(plr)
	local leaderstats = Instance.new("Folder", plr)
	leaderstats.Name = "leaderstats"
	
	local Strength = Instance.new("IntValue", leaderstats)
	Strength.Name = "Strength"
	
	local Fat = Instance.new("IntValue", leaderstats)
	Fat.Name = "Fat"
	Fat.Value = 0
	
	local Rebirths = Instance.new("IntValue", leaderstats)
	Rebirths.Name = "Rebirths"
end)