Young children on average learn 10 new words every day, using over 30 muscles in a complex manouvre to physically produce them through speech. A young childs language begins at home, about a year after they are born (although babies may still produce phonemes irregularly). It has been proven that children can learn language on their own howeverm, with a stimulus through pirmary socialisation, a method in which a child learns from their parents, the child is more likely to advance at a faster rate and learn language more quickly.
Robert Winston made the incredible finding that it is also natural for a child to be bilingual at an early age. This is because they use different areas of their brains to speak in multiple languages and so it comes as a second nature for a young child to communicate with two different sets of vocabulary.
Young babies develop speech once they are physically old enough to stop being breastfed. This is because through evolution, the laryx in a babies throat acts as a complex yet ingenious functioning part of their body as it blocks the vocal cords to allow the baby to breathe and feed at the same time. Once the baby is old enough the laryx will drop 3 centimetres making it possible for the child to start acquring and producing (although irregular) speech patterns.