Once again, science confirms that sign language is better for everyone. :-). In a recent study published in the Journal for Applied Behavioral Analysis, several infants were trained to use sign language (either instead of crying or regardless) with astounding results.
At one time, it took only about 10 days of training to induce infants to learn a particular sign and use it without being prompted, and this was true even for a different infant, also of very young age, with down syndrome!
The study provides solid evidence for the development of earlier-than-speech communication in very young infants (one of them was 5 months old. They can barely sit up that age!)
It was also shown that sign language does not hinder in any way the onset or quality of spoken language development. (that is, there was no evidence suggesting otherwise)
Bottom line: teach your babies to sign for a better tomorrow!
Hat tip to Cognitive Daily (press the link for a more detailed account).