How Long Do Babies Sleep in Cribs?

You are probably reading this at an odd hour, trying to figure out whether your baby's sleep setup is right for where they are now. You are not alone in that. Most babies sleep safely in a crib from birth through around age 2 to 3, though the right time to transition to a toddler bed depends on your child's size, mobility, and your crib's specific limits. Knowing the typical timeline and the safety signals that actually matter helps you make the right call for your family

If you are in the middle of nursery planning, the right sleep setup from day one makes the next few years a lot smoother. Here is what you need to know, stage by stage.

How Long Babies Typically Sleep in a Crib

The question "how long do babies sleep in cribs" can have two meanings. One is about nightly sleep duration. The other is about the total timeline: how many months or years a child uses a crib. However, both change as your baby grows.

Most families use a crib from the newborn stage through ages 2 to 3 years. The end point isn't really about age but physical limits and developmental readiness.

Typical Age Range

Most babies would need a full-size crib from birth through toddlerhood. The transition usually happens between 18 months and 3 years. Keeping a child in a crib longer, when it's still safe, tends to produce better sleep. A recent study found that toddlers still in a crib got an average of 29 more minutes of sleep per night than same-age toddlers already in a bed.

Crib Use Limits

The clearest signal that a crib has run its course isn't the age but the height of the child. According to the American Academy of Pediatrics, it's time to transition your child to a proper bed when they reach 35 inches tall or when the crib rail sits at or below chest level when standing. At that point, climbing out of the crib becomes a real fall risk.

Weight limits on standard cribs are typically around 50 pounds, but height is usually the more important factor here. Always check your specific crib's manual since manufacturers set their own limits.

Crib Sleep by Age and Stage

Sleep in a crib looks very different at two months than at two years. Crib use evolves alongside your baby's development, so the setup that works in the newborn days won't look the same by toddlerhood.

Newborn to 6 Months

Newborns tend to sleep a lot. According to the National Sleep Foundation, newborns typically need 14 to 17 hours per day in short stretches. By 4 to 12 months, that drops to 12 to 16 hours per day, including naps.

A crib is safe from day one, as long as it meets current CPSC safety standards. During these early months, the AAP safe sleep guidelines are non-negotiable:

• Always place baby on their back
• Use a firm, flat mattress with a fitted sheet only
• Keep the crib completely bare: no blankets, pillows, bumpers, or stuffed animals
• Room-share for at least the first 6 months

According to HealthyChildren.org, a separate sleep surface for your baby in your bedroom can reduce the risk of SIDS by as much as 50%. Don’t confuse it with bed-sharing, as the baby still needs their own surface.

If you're wondering what a bassinet is vs. a crib, here’s a simple explanation. A bassinet is a smaller, portable sleep space designed for the first few months, with a typical weight limit of 15 to 20 pounds. It should be discontinued once a baby starts rolling. While a crib is a larger, stationary sleep space that's safe from birth through toddlerhood.

to 18 Months

By 6 months, many babies begin sleeping longer stretches, often 6 to 8 hours at night, with many reaching that consistently by 9 months. This period is also when babies start tossing and turning more. Most begin rolling over between 4 and 6 months. Pulling to stand generally happens between 8 and 12 months.

When your baby starts pulling up, lower the crib mattress right away. Here are some key adjustments to make at this stage:

• Lower the mattress when baby starts sitting independently, around 4 to 6 months
• Move to the lowest setting before baby can pull to stand
• Remove any objects hung above the crib

18 Months to 3 Years

This phase is when the transition conversation usually starts. Most toddlers attempt climbing out of the crib somewhere between 18 months and 2 years, though some try earlier and others never attempt it.

The AAP recommends transitioning to a bed once a child reaches 35 inches tall or when the crib rail drops to chest level when standing, whichever comes first. According to Cleveland Clinic, a fall from the top of a full crib rail is roughly a 4.5-foot drop. Consistent climbing attempts are a clear signal to move. 

Factors That Affect How Long a Baby Stays in a Crib

Every child develops on their own timeline. Size, mobility, and sleep temperament matter just as much as how many months are on the calendar.

Baby's Size and Mobility

A tall, physically confident toddler may reach the 35-inch marker even before turning 2. A smaller child might stay safely in a crib well past their second birthday. What to watch for:

• Height reaching 35 inches, or the manufacturer's lower limit
• Pulling to stand in the crib: lower the mattress right away
• Consistent climbing attempts: start planning the transition
• Crib rail at or below chest level when baby stands

Sleep Habits

Some children adapt easily to a toddler bed. Others do better staying in the crib longer, especially if they don't yet have the impulse control to stay put. Children under 3 often lack the self-regulation to stay reliably in an open sleep space. At this point, here are some factors worth considering:

• Can your child follow basic safety rules?
• Is a new sibling coming who needs the crib?
• Are other significant changes already underway, like potty training or starting daycare?

How to Support Safe Crib Sleep

Safe sleep practices evolve as a baby grows, but the core principles stay consistent through the crib years.

Safe Sleep Setup

According to the AAP's 2022 updated safe sleep guidelines, every baby should sleep on their back, on a firm, flat surface, in a bare crib, with no exceptions for naps.

What belongs in the crib:

• Firm, flat crib mattress
• One fitted sheet, nothing else

What stays out for infants:

• Blankets, quilts, or pillows
• Bumper pads of any kind
• Stuffed animals or sleep positioners

Crib bumpers were permanently banned under the Safe Sleep for Babies Act of 2021, effective November 2022. If you've inherited a crib with bumpers, remove them. Keep cords from blinds and monitors out of reach, well away from the sleep space.

Mattress and Crib Fit

The mattress must fit snugly with no gaps at the sides. Nemours KidsHealth requires slat spacing of no more than 2-3/8 inches, roughly the width of a soda can. Only use cribs manufactured after June 2011, when federal standards banning drop-side rails took effect. Drop-side cribs were linked to at least 32 infant deaths before the ban.

How to Choose Crib Furniture That Lasts

Once you understand the sleep timeline, crib shopping gets easier. The goal is finding Lullabye Shop that is thoughtfully built to grow with your child so you're not replacing pieces every year and spending loads of money.

Lullabye Shop carries a wide selection of exceptional baby crib options from trusted brands, and with a little nudge from the support team, understanding the construction, material, and features will seem like a walk in the park.

Convertible Crib Options

A convertible crib is one of the smartest decisions a first-time parent can make. These cribs grow with your child, converting from a crib to a toddler bed and, in some cases, to a full-size bed or daybed. The cribs that support all of these transitions are constructed with a lot of thought and research. Lullabye furniture is designed with that full timeline in mind, from the first night home through the toddler years.

For families who want to browse kids' furniture online first, Lullabye Shop's full collection is on the site. But nothing replaces putting your hands on a crib rail in a 15,000-square-foot showroom for a sensory feel, where you can check the construction and see how a conversion works before committing.

Find the Right Crib for Your Family

Knowing how long babies sleep in cribs is the first step. The next is choosing a crib that meets current safety standards, fits your nursery, and is designed to grow with your child.

Lullabye Shop has been helping Wisconsin families set up beautiful and functional nurseries since 1956. Stop in to see the full selection, start your baby registry, or call 920.734.9332. The right crib is a lot easier to find when you can see it, touch it, and talk it through with someone who genuinely knows the concerns every parent has.