A new study has found that car seats should not be used as a place for infants to sleep. Researchers (University of Auckland) studied the breathing patterns of 78 infants during sleep while restrained in an infant car safety seat, with and without a foam plastic insert. The researchers found breathing problems are significantly reduced when the insert is used. However, researchers said the new study highlighted the importance of not using cars seats as a place for infants to sleep and that car seat use "should be restricted to the minimum time required for essential travel."