By Graham FisherA convertible crib is a crib that can be reconfigured into a toddler bed, daybed, or full-size bed as your child grows. Because it starts as a crib, every convertible crib must first meet all the safety standards that apply to any crib sold in the United States. The U.S. Consumer Product Safety Commission (CPSC) strengthened crib safety rules in 2011, banning traditional drop-side rails and requiring stronger mattress supports, more durable hardware, and more rigorous safety checks. Before you use a convertible crib, you need to confirm it complies with those rules and that you set it up correctly.
Crib safety standards that every convertible crib must meet
The CPSC’s 2011 rule stopped the manufacture and sale of drop-side cribs and made mattress supports stronger, hardware more durable, and safety checks more rigorous. Any crib you use, including a convertible model, should be manufactured after June 2011 to be sure it meets current requirements. Nemours KidsHealth advises that you check any crib, whether new or used, for slats that are no more than 2-3/8 inches (6 centimeters) apart and that are not cracked, loose, splintered, or missing. The same guidance says there should be no decorative cutouts on the headboard or footboard where a child could become trapped, and no sharp or jagged edges. Corner posts, if present, must be either flush with the top of the headboard and footboard or very tall (over 16 inches, or 41 centimeters), because anything in between can catch clothing and create a strangulation hazard.
Before you place a baby in the crib, also confirm that no screws are sticking out and that all hardware is original and tightly in place. The American Academy of Pediatrics (AAP) stresses that you should never substitute original parts with hardware-store pieces; replacement parts must come from the manufacturer. For more on the rules that govern crib design, see our article on crib safety standards.
Mattress, bedding and what to keep out of the crib
A firm, snug-fitting mattress is essential. Nemours KidsHealth recommends choosing the firmest mattress you can find and checking it yourself by pushing firmly on the center and all sides. The mattress should hold firm and spring back quickly. The AAP says that if you can insert more than two fingers between the mattress and the sides or ends of the crib, the crib and mattress combination should not be used. Always remove and destroy any plastic packaging from a new mattress before use.
Inside the crib, keep the sleep space bare. The AAP and Nemours KidsHealth both state that bumper pads, pillows, quilts, comforters, sheepskins, and stuffed animals should not be placed in the crib because babies have suffocated on such items. Use only a snug-fitting crib sheet, never an adult sheet. Instead of loose blankets, dress your baby in appropriate-weight sleepwear such as a wearable blanket or sleep sack. Remove bibs and necklaces before putting your baby in the crib, and do not hang toys by strings or attach pacifiers or medallions to the crib with a cord. Mobiles should be taken down when your baby starts pushing up on hands and knees or by 5 months of age, whichever comes first.
When to lower the mattress and when to move your child to a bed
The AAP advises lowering the crib mattress before your baby can sit, so they cannot fall out by leaning against the side or pulling themselves over it. Set the mattress at its lowest position before your child learns to stand. The most common crib falls happen when a baby tries to climb out, so the AAP recommends moving your child to another bed when they reach 35 inches (89 centimeters) tall, or when the height of the side rail is less than three-quarters of the child’s height (roughly nipple level). Following these milestones helps you use the crib safely through each stage. For a broader look at sleep spaces, you can compare options in our crib vs bassinet vs play yard guide.
Anchoring the crib and keeping the room safe
The crib is rarely the only heavy piece in a nursery, and dressers and TVs can tip. The CPSC’s Anchor It! campaign emphasizes that anchoring all furniture with drawers, doors, and shelves to the wall prevents tip-over injuries and deaths. A furniture anchoring kit, a drill, a screwdriver, and a stud finder are typically all you need. The campaign’s instructions are to attach a bracket to the wall, move the furniture close, attach the other bracket or plate to the furniture, connect the strap, and tighten it securely. Our furniture anchors and tip-over prevention article walks through the process in detail.
Beyond the crib itself, the AAP’s room-safety checklist advises placing the crib away from windows to prevent falls and strangulation from blind or drapery cords. The CPSC recommends using cordless window coverings if possible. Also, keep night-lights away from drapes or bedding where they could start a fire, and install smoke alarms outside every bedroom or sleeping area and on every level of your home. For a wider view of childproofing, see our baby safety category.
Conversion kits and long-term use
When you are ready to convert the crib into a toddler bed or full-size bed, follow the manufacturer’s instructions for your model, keep the assembly manual, and use only manufacturer-provided parts, as KidsHealth advises for any crib repair. Check that all parts are present and that the hardware is still in good condition. Because the crib frame remains in use, continue to inspect it regularly for loose joints, missing parts, or sharp edges. The AAP recommends inspecting the crib for damage before each assembly and weekly thereafter. If any parts are missing or broken, do not use the crib until you obtain the correct manufacturer replacement parts. As your child grows, the same anchoring and room-safety principles apply to the converted bed and any other heavy furniture in the room.
Key safety checks for a convertible crib
| Check or stage | What the guidance says |
|---|---|
| Crib safety standards | CPSC banned drop-side cribs in 2011 and requires stronger mattress supports, more durable hardware, and more rigorous safety checks. Use a crib manufactured after June 2011. (Source: CPSC, AAP) |
| Slat spacing | Slats must be no more than 2-3/8 inches (6 cm) apart to prevent head entrapment. (Source: Nemours KidsHealth, AAP) |
| Drop-side rails | Do not use a crib with a drop-side rail. The sale of drop-side cribs is banned. (Source: CPSC, Nemours KidsHealth) |
| Mattress fit and firmness | Use the firmest mattress you can find; it should fit snugly with no more than two fingers of gap between the mattress and crib sides. (Source: Nemours KidsHealth, AAP) |
| Lowering the mattress | Lower the mattress before your baby can sit; set it at the lowest position before your child can stand. (Source: AAP) |
| Moving out of the crib | Move your child to a bed when they are 35 inches (89 cm) tall or when the side rail is less than three-quarters of their height. (Source: AAP) |
| Anchoring furniture | Anchor all furniture with drawers, doors, and shelves to the wall to prevent tip-over injuries and deaths. (Source: CPSC Anchor It!) |
| Bumper pads and soft items | No bumper pads, pillows, quilts, comforters, or stuffed animals in the crib. (Source: Nemours KidsHealth, AAP) |
| Mobiles | Remove when baby pushes up on hands and knees or by 5 months, whichever comes first. (Source: Nemours KidsHealth, AAP) |
| Recalls | Check the CPSC website to see if the crib has been recalled. (Source: Nemours KidsHealth) |
Frequently asked questions
Can I use a convertible crib as a toddler bed from the start?
A convertible crib is designed to be used as a crib first, and the CPSC crib rules and the AAP’s safe-sleep guidance apply to that setup. The AAP’s point for moving a child to another bed is when they reach 35 inches tall or the side rail is less than three-quarters of their height, so keep it in crib form until then and follow the manufacturer’s instructions.
What should I look for when buying a used convertible crib?
Check that the crib was manufactured after June 2011 so it meets current safety standards. Avoid any crib with a drop-side rail. Inspect the slats for spacing no wider than 2-3/8 inches and look for missing or damaged hardware. Confirm that the crib has not been recalled by searching the CPSC website. Only use manufacturer-provided parts for any repairs, and make sure you have the assembly manual. If the crib was made before 1978, it may have a finish that contains lead, so it is not a safe choice.
When is it time to move my child out of the crib?
The AAP recommends moving your child to another bed when they reach 35 inches in height or when the height of the side rail is less than three-quarters of the child’s height. This is typically the point when a child can climb out, which increases the risk of a fall. If you have questions about your child’s readiness, ask your pediatrician.
For more on choosing a safe sleep space, visit our Cribs & Bassinets category page.
Sources
- Cribs (standards)
- Crib Safety | Nemours KidsHealth
- Choosing Safe Baby Products: Cribs | Nemours KidsHealth
- Make Baby’s Room Safe: Parent Checklist | HealthyChildren.org (AAP)
- Anchor It! Furniture and TV Tip-Over Prevention | CPSC
About Graham Fisher
Graham Fisher is part of our editorial team and reviews and edits our baby gear guides, checking product details against manufacturer specifications and owner feedback.
