Cleaning supplies : don't expose children to cleaning chemicals, as they can contribute to serious neurological problems. Opt for toxic-free instead, like white vinegar for floors and windows, and baking sode for sinks and tubs. Also, don't store them in low cabinets where children can reach them, and use lock-latches if necessary.
Second-hand smoke : in Canada, this is typically second nature to most, but it never hurts to be reminded. Second-hand smoke can lead to serious respiratory issues.
House plants : did you know that pointsettas, daffodils, and caladiums are poisonous? Remove them from a child's reach.
Electrical outlets : all should be in good condition, covered with outlet covers whenever possible.
Fire safety : every home should have working smoke alarms and fire extinguishers, know where they are.
Pots on stove: all handles should be turned toward the back of the stove so a child doesn't pull on it.
Medicines : keep all medicines out of reach.
Stairs : use safety gates to protect from falling down the stairs
Unattended child : never leave a child unattended on a bed or sofa, even if strapped into a carrier. Never leave a child alone near any water source (tub, pool, pond, etc). Use a playpen or crib to protect the infant while your attention is needed elsewhere, like a phone call.