On 2014 Jan 10, David Mage commented:

The authors note the incidence of SIDS < 1 year has declined but the proportion of neonates < 7 days has increased. This may be because the number of neonate SIDS has remained constant while the number of post neonates (7 < age < 365 days) has decreased. Using U.S. CDC data (wonder.cdc.gov) from 1999 to 2010 for ICDR95 SIDS the number of neonate SIDS per year has held constant at an average of 34 per year while total SIDS has decreased from 2616 to 2036.

On 2014 Jan 10, David Mage commented:

The authors note the incidence of SIDS < 1 year has declined but the proportion of neonates < 7 days has increased. This may be because the number of neonate SIDS has remained constant while the number of post neonates (7 < age < 365 days) has decreased. Using U.S. CDC data (wonder.cdc.gov) from 1999 to 2010 for ICDR95 SIDS the number of neonate SIDS per year has held constant at an average of 34 per year while total SIDS has decreased from 2616 to 2036.