How to save inventories of pets?

Hi, I'm struggling to save inventories of pets that a player can hatch. I've tried multiple tutorials and I can't seem to get anything to work/

local dataStoreService = game:service'DataStoreService'
local dataStore = dataStoreService:GetDataStore'HatcherGame_2'
local data = {}
local number = 0

local function saveData(pet)
    table.insert(data,pet)
    dataStore:SetAsync('Petting_Key_'..number,data[number])
end

local function loadData()
    local load_data = dataStore:GetAsync('Petting_Key_'..number)
    for i,v in pairs(load_data)do
        print(i,v)
    end
end

game.Players.PlayerAdded:Connect(function(player)
    if dataStore:GetAsync('Petting_Key_'..number) == nil then
        print("NO DATA")
    else
        loadData()
    end
end)

game.Players.PlayerRemoving:Connect(function(plr)
    for i,v in pairs(plr.Inventory:GetChildren()) do
        print(i)
        print(v)
        number = number + 1
        saveData(v)
    end
end)