John from Silver Spring, MD  April 11th, 2009 At first my twin babies did not respond to the wrist rattles. But once they turned 3 1/2 months old, the wrist rattles started to become a lot of fun. They become very aware of them and look at them frequently and shake their wrists to make them rattle. I don't keep them on long, however, as I think the fun would disappear if they were on baby longer than about 20-30 minutes or so.
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