Initial Sleep Location, Surface, Position, and Sleep Environment According to Age
| Variable | 1 Month (n = 160) | 3 Months (n = 151) | 6 Months (n = 147) |
|---|---|---|---|
| First sleep location | |||
| Parent room | 93 (58) | 68 (45) | 38 (26) |
| Own room | 54 (34) | 78 (52) | 101 (69) |
| Other room | 13 (8) | 4 (3) | 7 (5) |
| Sleep surface | |||
| Crib (crib, cradle, bassinet, playpen) | 127 (79) | 136 (90) | 130 (88) |
| Adult bed or mattress | 13 (8) | 10 (7) | 11 (7) |
| Car seat | 10 (6) | 3 (2) | 2 (1) |
| Swing | 4 (3) | 0 | 0 |
| Other | 3 (2) | 1 (1) | 1 (1) |
| Bedside co-sleeper (“sidecar”) | 2 (1) | 1 (1) | 1 (1) |
| Sofa | 0 | 0 | 2 (1) |
| Position placed on first sleep surface | |||
| Supine | 138 (86) | 123 (82) | 98 (67) |
| Side | 12 (8) | 15 (10) | 22 (15) |
| Prone | 7 (4) | 12 (8) | 25 (17) |
| Indeterminate (not supine) | 3 (2) | 1 (1) | 2 (1) |
| Loose/nonapproved items on sleep surface | |||
| Loose bedding | 134 (84) | 112 (74) | 101 (69) |
| Bumper pads | 39 (24) | 64 (42) | 70 (48) |
| Pillow/cushion | 31 (19) | 29 (19) | 30 (20) |
| Stuffed animal/pillow-like toy | 26 (16) | 39 (26) | 49 (33) |
| Sleep positioner/wedge | 22 (14) | 11 (7) | 1 (1) |
| Another person | 14 (9) | 9 (6) | 12 (8) |
| Other | 11 (7) | 8 (5) | 5 (3) |
| Mobile/hanging toy within child’s reach | 6 (4) | 7 (5) | 11 (7) |
| Hard toy | 5 (3) | 5 (3) | 18 (12) |
| SIDS monitor | 5 (3) | 4 (3) | 2 (1) |
| Bottle | 3 (2) | 1 (1) | 8 (5) |
| Loose cord/electrical wire | 3 (2) | 2 (1) | 2 (1) |
| Pet | 1 (1) | 1 (1) | 3 (2) |
| Is first sleep location shared with another person? | |||
| No | 145 (91) | 142 (94) | 135 (92) |
| Yes; parent | 14 (9) | 9 (6) | 11 (7) |
| Yes; other | 0 | 0 | 1 (1) |