This happens way too often at my house! How can homeschooling mothers still accomplish their goals for the day with a baby or toddler needing their attention? If you have several children, you’ve undoubtedly dealt with this issue. You can either choose a curriculum that requires very little input from parents, or you can find ways to keep your little one(s) occupied during school time.
You could try conducting lessons with a baby or toddler in your lap, while they perhaps play quietly or eat a snack. There could also be a special box of favorite toys that are only allowed out during school time, to keep little hands busy. I've found Play-Doh works great to keep a two year old occupied. Mostly though, just have patience and you'll get through the day. Eventually the schoolwork will get done!