my boys are 22 mos. apart...
for the first two weeks I brought my two year old to day care. Then I pulled him out and kept him home with me the rest of my leave. He was excited to stay home with mommy too...I think he felt left out being sent to day care...he really adores his little brother.
I never really had problems, during that time he learned how to be gentle with his new baby brother ... I gave him more responsibilities during that time, gave his small chores or tasks. We did a lot of baking. I 'taught' him how to do dishes...now everytime I do dishes he goes and gets his stool to help me. (if he still helps when he is 15, that would be really nice).
However when I was feeding the newborn, the first couple of weeks the toddler would get into thing (just when I thought I had everything childproofed...) I keep my make-up in a closet and he got into that and put lipstick on...all over his face...but that is all he really did.
I think it really depends on the mommy, I got bored at home on maternity leave...those new babies sleep all the time.
It would just take a week or two for you to get into some sort of pattern to know just when to feed the toddler, before/after the infant gets hungry...it gets difficult if the toddler is eating and then the infant is ready NOW...
It is really up to you and how your feeling after you give birth.