If you truly had pinkeye (viral), you are contageous for 7 days. But you are only contageous through your tears. So if you rub your eyes, you need to wash your hands prior to touching anyone. The pinkeye is caused by the same viruses that cause the common cold. Technically, you are much less contageous than someone with a cold who is sneezing or coughing on everything. You are only contageous through your tears. I usually don't make people stay off work unless they work with elderly, sick, or babies. However, understand that there is a social stigma with pinkeye. Most people don't think twice about a coworker coming to work with a cough or sneezing; but they shun you like a vampire if your eye is red.
Hope this helps and thank you.
You can play with your 3-year old. Just make sure that you don't rub your eyes and do wash your hands. Make sure that the baby doesn't get in your face.
I would allow you back to work. But you have to follow your employers wishes and guidelines on that.