Babies are born without any language skills, but they soon learn them from their families. It does not matter what language their family speaks, and they might learn several if they grow up in a bi-lingual home environment. Hearing a language spoken every day is how they pick up vocabulary, and they apply it through actions and approval by their parents. When they use a word correctly, they might be rewarded with a smile or hug. Incorrect usage of a word is often met with a frown, and some parents will correct their children immediately to help them learn.
Children born in one country and moved to another will often pick up a second language quickly. If they are taught a new language in school, they will also pick it up just as quick when they are young. Older children and adults often struggle to learn a new language, but those with a natural talent or determination can master a second language at any age.