What to buy first?!?!

So my husband and I are on a tight budget and expecting in July. I'm thinking we need to buy a box of diapers and one big ticket item a month to help manage the expenses of a newborn. We don't have a lot of help, so we will be buying most everything on our own. I'm looking out for coupons, sales and lightly used. I'm just not sure where to start! What do you all recommend?

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