Table 1.

Awake Characteristics of Study Infants (n = 351)

Infant AgeMean Awake Time (Hours/Day)Mean Awake Time Spent Prone (Hours/Day)
Supine
Sleepers
Mixed/Side
Sleepers
Prone
Sleepers
PValue*Supine
Sleepers
Mixed/Side
Sleepers
Prone
Sleepers
PValue*
1 Week7.186.576.26.110.540.481.42<.0001
1 Month8.744.684.30.010.740.681.79<.0001
2 Months9.479.128.99.310.900.922.44<.0001
3 Months10.439.989.80.151.181.312.92<.0001
4 Months10.7910.4710.30.151.722.163.14.0003
5 Months11.3010.7210.66.042.163.063.87<.0001
6 Months11.4610.9010.74.022.593.403.70.003
  • * Represents P value for prone sleepers versus supine sleepers.