I have used electronic Bug Zappers indoors. They are meant for outside, but work just fine indoors and are harmless unless you stick your finger inside and get zapped. Hang from ceiling and baby cant get to it unless baby climbs ladders :)
Be sure to put some sort of pan under it, or there will be dead bugs all over the floor. I modified a cat litter box to hang below the zapper. It aint pretty but it does the job. Of course you do get to listen to them fry SNAP SNAP SNAP....
Mark