An 8 month old scooting around the room at lightening speed sitting in his walker may have access to items on shelves or table tops which he couldn't get to previously. Walkers are a particular danger near stairs. When a child falls down the stairs in a walker, the walker prevents his natural protective reflexes from breaking the fall. Walkers may tip over on carpeted floors if the infant struggles to move a walker stuck in the carpeting. Never place your infant in a walker unless you intend to stay by his side the whole time he is in it.
Guns pose a danger to children of any age.
A loaded gun should never be kept anyplace where any child has access to it. It is unlikely that a toddler could fire a gun even accidentally, but if you have firearms in your house, it's best for children to learn early on that they aren't playthings. While accidental discharges from a firearm are rare, the statistic would be no comfort if your child is hurt by a bullet from a gun he handles. Cigarette lighters and matches left on table tops are a potential fire hazard. Toddlers and young children love to imitate adults.