It's a mix. I started my home daycare 11 years ago. I've had many clients stay from 6 mos/1yr until school age. Some stayed with me until well into school. One little girl just left at 9 yrs only because I moved. Another, 6 yr old, has been with me since 4 mos.....now just wknds, which I'm ok with as I miss her. However, I've had a few stay only a year or 2 but most are 3 yrs and up. I think it depends on your area too. I was in a rural area where daycare and clients are sparse. Usually parents and I were happy to have found each other so we held on. I suspect it's different in a city.

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