"I know dogs" is grammatically correct English, but it would not be a common thing to say. In what context are you intending to use it? I don't understand what connection there is with baby talk or babies.
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fivejedjonIt seems to me, onizo, that you are asking us if a certain construction produced by your baby is acceptable. If that is so, then relax, for heaven's sake. Any speech sounds produced by a baby should be a delight to its parents.Thank you, fivejedjon.