I chat a lot with friends about this- what to do with a toddler or baby during homeschool time. Toddlers can be fun and sweet, but they can also be really distracting during school time!
Some things that I have found to help, in no particular order:
-sink full of bubbles with cups to pour
-dry beans/rice to sort
-safety scissors and old magazines
Mostly, it is training the toddler to be quiet and to play solo for short periods of time.
I think babies are easier- they can sit on mom's lap, sleep, or nurse.
Anyone else have useful tips?