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There is only a small window of opportunity to correct the infantâs skull. As the rate of skull growth is faster in the early ages, helmet therapy is most effective between the ages of 3 to 7 months. However, helmets are still effective until the infant is 12 months old.
When did the helmet law go into effect in California. California Helmet Law was implemented on January 1, 1985, covered ages 15, 6 months or younger. The law covering all riders took effect January 1, 1992. Motorcycle helmet laws vary widely among the states and have changed a lot in the past half a century.