Which reminds me -- weapon proficiencies shouldn't be a right of birth, but instead awarded based on culture/upbringing.
Level Up: Advanced 5th Edition has it where weapon proficiencies are based off of the Culture you grew up in. So, you could be a human who grew up in a Mountain Dwarf Culture and learned their weapon proficiencies.
The human would gain these traits for being raised in a Mountain Dwarf culture:
Dwarven Weapon Training. You have proficiency with the battleaxe, handaxe, light hammer, and warhammer.
Dwarven Armor Training. You have proficiency with light and medium armor.
Heart of the Forge. You have
resistance to fire damage. In addition, you gain proficiency in Engineering.
Mountain Born. You’re acclimated to high and low altitudes, including elevations above 20,000 feet or depths below 20,000 feet. You’re also naturally adapted to cold climates.
Stonecunning. Whenever you make a History check related to the origin of stonework, you are considered proficient in the History skill and gain an
expertise die to the check.
Languages. You can speak, read, write, and sign Common, Dwarvish, and one other language.