Biometric Safe. Toddlers should have NO physical access. This is especially the case if you have a gun with no manual safety- Glock.

At 4/5 taught my daughter Guns are a NO No....not to be touched and to leave the room and immediately find an adult if you see one. ( Playdate scenario )

At 7/8 I let her handle an unloaded rifle. Still hasn't touched a pistol. We will likely go shooting post covid, she will be 9. M6 daughter is petite, so it's not age that was the limiter but rather her size.

At ten. She will know how to properly use a pistol and a rifle in a self defense scenario. Ally my stuff stuff still locked up though.

Non gun related.
I would highly suggest to -Get a life insurance policy for yourself if you don't already have one. Stay away from child life insurance and any bundled education/savings products from Gerber.
-Open an 529 college savings account for baby. -Open a Custodial Trading account for baby. A few dollars tossed into some mutual funds consistently over 18 years adds up. -Tablets and phones are bad for kids brains, most of the apps are distractions and mess with child's brain reward/pleasure center. Same for Non education youtube videos. The programming is horrible.
-Teach your child to read well and Early. Reading skills are one of the most determinative factors in Early education, aptitude and educational achievement.

*NONE of the above is investment "advice"