School is a LOT easier to deal with sick kids than work (having done both).
Practicums can get a little dicey (because you're actually working), but that's only a couple quarters.
When my son has been sick, I just email my professor and get the assignment, or email my assignment in. There are only 2 days that one absolutely CANNOT miss every 3 months. Midterms and Finals. But lets break it down :)
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Snow days? Colleges close, too. They tend to follow the local public school closures.
Sick over midterms/finals? (Happened twice in 6 years. 1 time had a friend come over while he watched Nemo, was home before Dude Crush on the EAC made his debut... the other time I emailed the professor the night before and she had me come in and take the test in an empty office WITH my son. No time limit. But it was done in 30 minutes. She said if he was too bad off she'd give me a take-home-test aka waaaaaay harder than an inseat final that I could email in)
Sick any day other than midterms/finals? Email the prof IF necessary (attendance isn't mandatory in most classes, so it's only for heads up/ assignments) and then: Stay home.
No School Days? (Also PT conferences, half days etc): You know about those in advance. IF you have class that day, you put them into a "We've got you covered" halfday or fullday camp (through sports places, drama places, ymca, etc) to cover childcare, the same way working parents deal with no school days.
LOADS easier to find childcare for 10 hours a week than for 45-50 hours per week (to include commute time), and the various "oops" that happen, it's just easier to cover in academia than it is in corporate land.
Personally I've never gone full time. 2 classes max (3/4 time). Sometimes I'll do 4 days of school (for about 2 hours each), and sometimes I'll do M/W or Tu/Th. Same classes, just stacked so I'm gone 2 days a week, or spread out so all 4 days are mostly "identical". I studied at night and when he was sleeping when he was little. When he was in preschool, I did most of my work THEN. Unless there happens to be a school break or you've got childcare you CAN'T count on cramming the week before exams, so you have to stay up on your work... but if you DO have a chilcare option... 2 weeks a quarter; you have them go for extra time right before midterms and finals.