Teaching little kids sign language

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My little cousin was taught sign language before she could talk. That way she could comunnicate without words and would be as frusterated. If she wanted or needed something she could sign it instead of just crying or going waa waa goo. Is this a good thing to do? I think yes because then they can comunicat and feel like they are getting their point across. If they need to go to the bathroom they just sign it instead of waa waa poop. If they are thirsty they can sign bottle or drink instead of waaaaaaaaaaaa. It might not be a good idea though because then they might not have the urge to learn to actually talk. They may just rely on the sign language. What do you think?