My general rule is stay home with a fever or first 2 days of cold. A cold on its way out with an energetic kid and slightly runny nose is okay IMO. Sometimes dd still ha a runny nose for 2 weeks after a cold so u wouldn't keep her home all that time
If there's no fever or vomiting & he's acting normal, I send him wherever. (Exception, if we're going somewhere with a newborn or someone immunocompromised.)
If we stayed home with a simple cold, we'd be stuck at home October - April.
DS pretty constantly has a runny nose and cough. Sometimes it's a cold. Sometimes it's seasonal allergies. Sometimes I have no fucking clue what it is.
But no fever and he's bouncing off the walls? Off to daycare my friend.
If my child is sitting there glassy-eyed and falling asleep at weird times....sick day. If his nose is a leaky faucet with green snot....sick day. If he has energy with just a little wet nose, I bring him in. Coughs......I can have a cough that goes on 2 weeks after my cold symptoms disappear.
Unless you're spiking a fever, puking, or in the first 24 hrs of an antibiotic you're going to your daycare/school/camp. There's not enough sick time for me to keep them home for every incident.
My nephew spent a year straight with a cold. He would have never gone anywhere.
I personally usually stay home and rest the first day I have a cold because they hit me really hard and I get better a lot faster if I just rest. I go out and about the other 5-10 days though.