RT Journal
A1 Brenner RA, Willinger M, Simons-Morton BG, Hoffman HJ, Clemens JD
T1 PUtting babies "back to sleep"—reply
JF JAMA
JO JAMA
YR 1999
FD March 17
VO 281
IS 11
SP 983
OP 984
DO 10-1001/pubs.JAMA-ISSN-0098-7484-281-11-jbk0317
UL http://dx.doi.org/10-1001/pubs.JAMA-ISSN-0098-7484-281-11-jbk0317
AB 
In Reply: In the National Infant
Sleep Position (NISP) study we deliberately asked caregivers if their
baby was placed for sleep in a specific position.1
Respondents reported a specific, usual sleep position for 97% of
infants. Similarly, 87% of respondents in the District of Columbia
reported usually placing their infant in a specific position, side,
back, or stomach.2 The stability of various sleep positions
was assessed in the NISP.1 The supine and prone sleep
positions are very stable from birth through 15 weeks of age with about
a 96% probability that infants will be found in the same position in
which they are placed. The supine position, the current recommended
infant sleep position, remains relatively stable at 16 to 23 weeks and
at 24 to 28 weeks (84% and 68% probability of being found supine,
respectively).