M.4.
A 2 year old will likely not entertain himself. If you sit with him and do the activity with him, you will keep his concentration longer.
Having a baby with a 2 year old is a juggling act. I know... I had 3 in 3 years. But I learned quickly, that all the time I had between feedings had to be devoted to my other kids in order for everyone to stay sane... And TV was never an option because 1) I refuse to resort to it for longer then 1 hour a day of educational TV and 2) they couldn't care less about the TV being on, so it just caused more noise in the house.
My Suggestion is to make plans to keep the little guy occupied... It was hard for me, and will be for you, but once you get the hand of it, its manageable... For example: One day, go to Story Time at your library. your baby is small enough not to be a bother and your little guy will get out of the house and get his mind going. On another day, take them to the park. Yet another to a playdate. Everyday, try to get out for a walk - it'll do everyone good!
And another thing, keep a schedule so that he knows what is expected of him. Having a little baby, that'll be tough for another couple months, but eventually it will work out and everyone will love the routine.
Also, since you have another little one, make sure to spend some quality alone time with DS so that he knows that he's still important and loved.
Best wishes!