Dimensions / Furniture / Baby cribs / Full-size
A US full-size crib has an inside of 28 × 52 3/8 in (71 × 133 cm), ± 5/8 in, by law (16 CFR 1219), and takes a mattress at least 27 1/4 × 51 5/8 in (69.2 × 131.1 cm) and no more than 6 in (15.2 cm) thick. The sides must stand at least 26 in (66 cm) above the mattress base at its lowest, and the crib should no longer be used once the child reaches 35 in (89 cm). Outside, IKEA’s SNIGLAR is 136.8 × 74 × 84.1 cm.
| Inside, W × L | Mattress, at least | Side above the base, at least |
|---|---|---|
| 71 × 133cm28 × 52 3/8 in | 69.2 × 131.1cm27 1/4 × 51 5/8 in | 66cm26 in |
Sources: 16 CFR 1219, 16 CFR 1241, Federal Register (75 FR 81766). Checked October 2026.
Enter the mattress, the rail height above the base at its lowest and your child’s height. Each check uses the numbers in the tables on this page.
All in centimetres. 1 in = 2.54 cm.
A 69.9 × 132.1 cm mattress, 12.7 cm thick, meets the US minimum of 69.2 × 131.1 cm and the 15.2 cm limit.
The 16 CFR 1241 minimum and the 6 in limit printed on every crib; push the mattress into a corner and check for gaps.
The rail is 67.3 cm above the mattress base at its lowest; the US rule asks at least 66 cm.
Measured from the top of the mattress base at its lowest. Lower the base once the child can pull to standing.
At 80 cm your child is under the 89 cm at which the crib should no longer be used.
The crib makers’ warning: stop when the child can climb out or reaches 35 in, whichever comes first.
Setting up a nursery for a client? Photograph the room, mark the windows and doors in SizeMarker and check the crib and mattress before you order.
Mark a photo| Crib | L × W × H |
|---|---|
| IKEA SNIGLARTwo base heights; 17.1 cm (6 3/4 in) free under the crib | 136.8 × 74 × 84.1 cm53 7/8 × 29 1/8 × 33 1/8 in |
| IKEA SUNDVIKConverts into a toddler bed | 138.1 × 75.9 × 87.9 cm54 3/8 × 29 7/8 × 34 5/8 in |
| IKEA GULLIVERTwo base heights | 136.8 × 74.9 × 84.1 cm53 7/8 × 29 1/2 × 33 1/8 in |
| IKEA GONATT, with drawer | 135.9 × 74.9 × 112.1 cm53 1/2 × 29 1/2 × 44 1/8 in |
| Delta Children Heartland 4-in-1Three base positions; rail 67.3 cm (26.5 in) above the lowest; 14.5 kg (32 lb) | 137.8 × 72.4 × 88.9 cm54.25 × 28.5 × 35 in |
Sources: IKEA (SNIGLAR) · IKEA (SUNDVIK) · IKEA (GULLIVER) · IKEA (GONATT) · Delta Children (Heartland)
| Rule | Size |
|---|---|
| Inside width16 CFR 1219, at the mattress base | 71 ± 1.6 cm28 ± 5/8 in |
| Inside length | 133 ± 1.6 cm52 3/8 ± 5/8 in |
| Mattress, at least16 CFR 1241 | 69.2 × 131.1 cm (690 × 1310 mm)27 1/4 × 51 5/8 in |
| Mattress thickness, at mostWarning every crib must carry | 15.2 cm6 in |
| Gap that means the mattress does not fitPushed into one corner | Over 3.8 cm1 1/2 in |
| Side top above the base at its lowest | 66 cm26 in |
| Between slats, at mostCPSC: about the width of a soda can | 6 cm2 3/8 in |
| Drop sidesSince 28 June 2011 | Not allowed |
Sources: 16 CFR 1219 · 16 CFR 1241 · CPSC · Federal Register (87 FR 8640) · Federal Register (75 FR 81766) · CPSC (safety tips) · CPSC (2011 rules)
| Guide | Size |
|---|---|
| Stop using it when the child reachesBabyletto, DaVinci and other makers’ warnings | 89 cm35 in |
| Move to a bed at aboutAAP | 91.4 cm3 ft |
| Lower the mattress baseBabyletto | Once the child can pull to standing |
| Where to put itCPSC | Away from windows and cords, preferably on another wall |
| Room sharingAAP | At least the first 6 months |
Sources: Babyletto (Hudson manual) · AAP (HealthyChildren.org) · CPSC (window cords) · AAP (safe sleep)
28 ± 5/8 in (71 ± 1.6 cm) wide and 52 3/8 ± 5/8 in (133 ± 1.6 cm) long, measured between the innermost surfaces at the level of the mattress base (16 CFR 1219).
At least 27 1/4 × 51 5/8 in (69.2 × 131.1 cm), the 16 CFR 1241 minimum, and no more than 6 in (15.2 cm) thick. Push it into a corner: a gap over 1 1/2 in (3.8 cm) means it does not fit.
At least 26 in (66 cm) from the top of the mattress base at its lowest to the top of the side. Delta Children’s Heartland gives 26.5 in (67.3 cm).
Crib makers’ warnings say to stop when the child can climb out or reaches 35 in (89 cm); the AAP suggests a bed at about 3 ft (91.4 cm).
No more than 2 3/8 in (6 cm), about the width of a soda can, says CPSC.
Away from windows and window-covering cords, preferably on another wall (CPSC); the AAP advises room sharing for at least the first 6 months.
Some leave a gap: IKEA’s SNIGLAR has 17.1 cm (6 3/4 in) free under the crib and two base heights, while the GONATT builds a drawer into the base and stands 112.1 cm tall.
Full-size cribs sold into the US must meet 16 CFR 1219, so buyers ask the inside size, the mattress positions, the rail height, the warning labels and whether conversion kits exist. Mark the real sizes on your own product photo in SizeMarker, as in the picture at the top, and send one product card for WhatsApp or WeChat.
