Baby spending is a gaseous thing. It expands to fill the size of your budget.
All a baby needs is onesies, diapers, food, some blankets and a place to sleep. A car-seat and a stroller for going out (plus some blankets, etc for keeping warm). Anything else is gravy.
The kid will be fine. Quit worrying.
You will have to ease back into outside social engagements but you will sort things out.
Young children sleep a lot.