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Do you remember “How does language develop?“? In a nutshell, here is an overview of how language develops.
By the way, children who are raised with two or more first languages follow the same development path as monolingual children. So, their milestones and development in terms of vocabulary and grammar are pretty much the same!
IMPORTANT: Each child is unique in the way that she develops language so some children may reach the milestones earlier, others may reach them a bit later. Important is that there is noticeable progress!