What the others said makes sense, but I'd add that costs vary wildly depending on where you live. Where I am, diapers cost noticeably less than in other regions, and if you go with formula instead of breastfeeding, the budget changes quite a bit. What I'd say is don't get too hung up on a specific number: keep in mind the first months are heavier (layette, crib, stroller), then it stabilizes around essentials, but then surprises come along like private vaccinations, specialist visits, or unfortunately illnesses nobody predicts. The advice I'd give you is to build a safety margin into your budget and track your actual spending over your first three months, so you see how it goes in your specific situation.