Moving too early introduces fall and independence risks that a child isn't ready for. Waiting too long can become a safety issue as a child grows confident enough to climb out. This guide explains what to watch for, how to make the transition safely, and what to look for in the mattress they'll sleep on next.

The primary safety trigger: when a child can climb out of the crib. A child who can — or is close to being able to — climb out of a crib faces a greater fall risk staying in the crib than moving to a low bed with proper fall protection. This is the clearest signal that it's time, regardless of age.

Other indicators that the transition may be appropriate:

Height. Most crib safety guidelines recommend transitioning when a child reaches 35 inches tall or when the top of the crib rail is below mid-chest height. At that point, the crib's containment function is effectively gone.

Developmental readiness. Some children begin requesting to sleep in a "big kid bed" and show the self-regulation to stay in bed through the night. Others are not ready at 3 — and that's fine. There is no developmental benefit to moving earlier than necessary, and the crib's containment can be an asset for families managing sleep boundaries.

A new sibling is coming. If a new baby will need the crib, plan the transition 6–8 weeks in advance of the birth — not right before or after, when the older child is navigating the emotional adjustment of a new sibling. An early transition with plenty of time to establish comfort is better than a rushed one.

Age range as a guideline, not a rule: The American Academy of Pediatrics does not specify a minimum age for transitioning from a crib. Most pediatricians suggest waiting until at least 2 years old unless a safety reason (climbing) requires earlier action. Many families wait until 3 or beyond without issue.

A toddler bed uses the same mattress dimensions as a standard crib (28" x 52"), so you can keep the same mattress while transitioning to a lower frame with side rails. A twin bed is a full-size transition to the mattress a child may use through grade school or beyond.

Toddler bed: Lower cost if you already have a crib mattress. A familiar mattress may ease the transition. Lower profile reduces fall risk for younger toddlers. Downside: another purchase and another transition when the child outgrows it.

Twin bed: Skips the intermediate step and buys more years of use. Requires a proper guardrail for young children. May feel very large to a toddler initially. Many families make this transition successfully, particularly if the child is toward the older end of the transition age range.

The Avocado Eco Organic Kids Mattress is designed for exactly this transition — a 7.5" low-profile twin mattress built for bunk beds, trundle beds, and children graduating from a crib, holding the same six finished-product certifications as every Avocado mattress. See: Avocado Eco Organic Kids Mattress.

Use a guardrail. For any child under 5 transitioning to a twin or full bed, a guardrail on the open side of the bed prevents nighttime falls. Most pediatric sleep experts recommend keeping it in place until the child has demonstrated stable nighttime positioning.

Keep the mattress low to the floor initially. A mattress on a low-profile frame or directly on the floor reduces fall height significantly during the adjustment period. Platform frames without box springs keep the sleep surface closer to the ground.

Maintain sleep hygiene consistency. Bedtime routines — same time, same sequence — matter more during transitions than at any other point. The physical change of sleeping environment is disruptive enough; consistency in everything else reduces the adjustment period.

Let the child be involved. Allowing a toddler to choose their bedding, pillow, or stuffed-animal companion gives them a sense of ownership over the transition. Small elements of control support a sense of safety in a new sleep environment.

The same material principles that apply to a crib mattress apply to a toddler or kids' mattress — children's bodies are still developing, and the exposure logic of a certified organic sleep surface remains fully relevant through childhood.

The firmness requirement shifts from the strict "firm only" rule for infants to a surface that supports a growing child's spine without the suffocation concern of infant sleep. A medium-firm surface is generally appropriate for toddlers and school-age children.

Certifications worth requiring for a kids' mattress: GOTS finished-product certification, OEKO-TEX® Standard 100 Class I, MADE SAFE®, GREENGUARD Gold, and UL® Formaldehyde-Free. The Avocado Eco Organic Kids Mattress holds all six of Avocado's finished-product certifications — the same stack as the adult lineup. See: Fit Guide: Kids.

Most children transition between 18 months and 3.5 years of age. The clearest signal is safety-driven: when a child can climb out of the crib, the crib becomes a fall risk, and the transition should happen promptly. Without that trigger, waiting until ages 2.5–3 is appropriate for most families.

A toddler bed is not necessary. Many families transition directly to a twin, particularly with a guardrail and a low bed frame. The toddler bed has the advantage of using the existing crib mattress, which may ease the cost and the transition for younger toddlers. For older toddlers (2.5+), a twin is often the better long-term investment.

This is extremely common in the first weeks and is a normal response to newfound freedom rather than a sleep disorder. Consistent, calm responses — returning the child to bed without engaging or rewarding the behavior — and robust bedtime routines typically resolve the pattern within 2–4 weeks for most children.

The same certifications that matter for a crib mattress continue to matter through childhood. Look for GOTS finished-product certification, OEKO-TEX® Standard 100 Class I, MADE SAFE®, GREENGUARD Gold, and UL® Formaldehyde-Free. See: Organic Crib Mattress Buying Guide and Fit Guide: Kids.