Cinnamon does work! Several years ago, I had an ant super-highway from my door to my pantry. That was a long highway, two directions, and it amazed me how orderly it was. No road rage whatsoever!
I was on a conference call for work and couldn't go out to get bug spray. Nor could I just let the invasion continue. My mother told me years ago that ants can be 'discouraged' with cinnamon. I had that, so sprinkled it from the door to the pantry. Finished my call and went to the store to get ant spray.
I wasted my money on the ant spray. When I returned home, all of the ants were gone!
I used cinnamon again at my daughters home. The ants appear to writhe in agony when they come in contact with the cinnamon.
However, with a crawling baby, I don't think cinnamon is a good idea unless it can be sprinkled in a place the baby can't reach. Counter tops, near water sources and cabinets ought to be ok. I also sprinkled some under the door sills of my house, just in case.
Good luck with the ant problem.