Question

1. It is of no use to cry like a baby.
2. It is no use crying like a baby.
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Are both the same and grammatical?
Is 'it' a false subject? Is 'to cry like a baby' and 'crying like a baby' a real subject?

Answer 1

#1 is incorrect, but would be better if you use "crying" instead of "to cry."

#2 is correct.

"It" is the subject.
http://learnenglish.britishcouncil.org/en/english-grammar/pronouns/it-and-there