maybe you will have to take things in your hand and show him that unless he helps out, there is not much you can do for long.
head out with baby and spend the day out, shopping for essentials and such, but don't cook anything at home for him. maybe he will end up being forced to make something for himself.
next time, head out alone on a day when he is at home and tell him it is something you cannot avoid. tell him what is kept where and just go. i am sure that by the time you come back, he will get a dose of what it is like to handle a baby alone the entire day.
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