Kids are 3 and 1.
We spend about $25 extra in utilities per month for 2 kids. Water is a fixed rate but we keep it cooler/warmer depending on the season and do an extra load of laundry (offsite).
Each kid's birth was about $3,000 OOP. Including a doula. I had a prenatal visual complication with my first that cost about $1,000. Both kids saw a few specialists in the first few months after birth (ENT, Orthopedist, Pediatric Dentist, Urologist...). We paid about $1,000 per kid for those visits. We thankfully haven't had many sick visits to the pediatrician. But did have an earache one weekend and had a $350 urgent care bill. We spend $40 on dentist visits per year that our insurance doesn't cover.
We spend about $75 on consumables per month. $35 for diapers, $15 for wipes, then up to $25 for random stuff like vit d drops, medicine, baby shampoo, toothbrushes...
We spent $20 per month on ingredients for introducing solids from 6-9 months, then our babies just ate what we ate. Our grocery bill went up $25/week once kid#2 started eating regular meals. It was time to raise the amount at that point but we didn't spend more with kid #1.
We spend $200/yr per kid on clothes, shoes, and outdoor gear.
I spent $600 on stuff (crib, bottles, nursing pillow, white noise machine, baby carrier, car seat, etc.) Babies don't need much, but baby gear sure makes parent's lives easier! I found a kid's consignment after baby #1 was older. Probably could've slashed that amount in half or lower. The registry for baby#1's shower helped.
I spend $50 per baby on postpartum supplies (adult diapers, stool softener, tucks pads, all that good stuff). Prenatals cost me about $150 per pregnancy.
I spent $150 on a diastasis recti/pelvic floor recovery program. It's Mutu Mamas. I highly recommend it. Also spent about $1,000 to work with a postpartum therapist with baby #1 Because of COVID, I continued sessions with her via telehealth for free. I knew that becoming a parent was a huge, huge transition and I wanted support. Money well spent!
We rarely eat out, but that costs an extra $10-$20 a pop.
You have to buy more airplane tickets after they turn 2.
We didn't increase house or vehicles.
I stay home, so no daycare. But the opportunity cost is about $20,000, not counting lost retirement savings etc. Oh, and I'm spending about $1,000 on home preschool - curriculum, books, supplies, outings-