Make a note of your answers and then compare notes with my comment. Comprehensible language is vital to the language learning process. Unlike spoken language, sign language has no grammar rules. You don't have to correct a baby's language for acquisition to occur. It's not necessary to be able to describe the rules of grammar to be a fluent speaker.
Babies only say things that they have heard someone else say.
Behaviourists say that we learn language by responding to stimuli, without any inborn idea of how to do it. A baby might have difficulty acquiring Esperanto as a mother tongue. L2 learners always do better if made to speak from the start. There is an infinite number of grammar rules in English.