As long as Advion is used according to label directions - placed in cracks, crevices, cabinets, etc, the chance of your toddler coming in contact is remote. Simply being in the same room as the Advion poses almost Zero risk. It has no odor and does not work on vapors or smell. Advion has to be eaten by cockroaches in order to kill them.
Keep it away from your little one and all should be well!