Just sit right back and you'll hear a tale NANNIES F*CKING SUCK. We are $200k/yr, a 2yr old and 4yr old. Four-year-old was in a nanny share with her cousin for a year, from 6mo to 18mo. We commuted to them, an 11min walk which sucked in winter. We went through four experienced nannies (with excellent references) in that time. We paid each person $17/hr, agreed to pay for 50-hr/wk regardless (usually kept it to 40-45), no other duties required, 15 days vacation, unlimited sick time, and Christmas bonus which is a week of pay the first year and two weeks pay after that. One cried about the strain of the job, one came into my bedroom when I was WFH and complained about the pay, each took sick time right and left, and we had to fire one after 3 weeks when, after all the other problems with her, she no-call/no-showed.
Fortunately, my parents or I were able to fill in for every absence for free. Who will cover for your nanny?
We put the our eldest in the Montessori daycare behind our apartment, and she loved it. No commute! It's open 6a-6:30p, $830/wk EDIT: every 2 weeks (so $415/wk). Sibling discount is 10%. Closed Christmas Day, Thanksgiving, and Fourth of July. When our now-2-year-old was 6mo, we just put her straight into infant daycare. They adored her and we had a great experience. She's always been developmentally ahead, so I take that to mean they did things right. Last year, our girls were there Christmas Eve day with a bunch of other kids... I wrapped all the presents; it was awesome.
My sister and her husband (also $200k/yr, also a 2 yr old & 4 yr old) stuck with the nanny model of childcare. She retained the last nanny, and gave her a raise to $18/hr. The woman had endless family emergencies and illness, took WAY more vacation than was allotted, quarantined for 5 weeks at the beginning of Covid (until my sister said they would have to stop paying her), and asked to work 4 days/wk when she returned. Oh, and my 4-year-old nephew (3 yrs old at the time) was in preschool 3 mornings a week all last school year, but the nanny refused to pick him up, so my parents had to do it.
Because the nanny was absent so often, my sister couldn't keep asking my parents to cover, so she hired last-minute nannies from a service she had on retainer. It was big money, and then, of course, she was also paying her regular nanny on those days. We figured she spent $8k-10k on coverage last year.
So think it through: coverage, boundaries, paying employer-side taxes or risking the consequences, having to fire and possibly hire again (and again and again). It just wasn't worth it for us.