You can increase either your Dexterity or Constitution by 2, and the other by 1.

Dwarflings mature at the same age as humans but can live 200 to 300 years.

Dwarflings are usually between 3 and 4 feet tall. Your size is Small.

Your base walking speed is 25 feet. Heavy armor reduces your speed by 5 feet instead of 10.

Your Dwarvish heritage improves your eyesight to be able to see short distances in the dark. You have Darkvision out to 30 feet.

You have resistance to poison damage, as well as advantage on saving throws against being poisoned.

You have advantage on saving throws against being frightened.

You gain proficiency with the artisan’s tools of your choice: smith’s tools, brewer’s supplies, or mason’s tools.

You are proficient in History checks related to the origin of stoneworks.

You can speak Common, Dwarvish, and Halfling.