During the first few months, reaching into the crib usually feels pretty simple. Then your baby starts moving more.
Rolling turns into sitting. Sitting turns into pulling up. And suddenly, the mattress height you barely thought about when assembling the crib becomes something worth paying attention to. The important thing to know is that crib mattress height isn't really about reaching a certain age. It's about what your baby can do.
As babies become more mobile, lowering the mattress helps keep the crib appropriate for their changing abilities. Always follow the instructions for your specific crib when adjusting the mattress support.
What to Keep in Mind With Crib Mattress Height
Babies reach milestones at different times, so there isn't one date on the calendar when every crib mattress should be lowered. Instead, pay attention to new movement.
A few things to watch for include:
- sitting up independently
- getting onto hands and knees
- pulling up using furniture or crib rails
- standing with support
- becoming noticeably more mobile in the crib
By the time a baby can pull to stand, the crib mattress should be at its lowest setting. Checking the crib manufacturer's instructions is important too, since the available mattress positions and adjustment guidance can vary between models.
Start Higher During the Newborn Stage
When babies are very young and aren't yet mobile, many adjustable cribs offer a higher mattress position. The Storkcraft® Santorini® Deluxe 5-in-1 Convertible Crib with Bonus Toddler Guardrail, for example, has four adjustable mattress heights, including a newborn height option.
That higher position can make it easier to reach your baby during those early weeks, when you're placing them in and taking them out of the crib several times a day. As movement develops, the mattress can be moved down.
It's one of those crib features that may not seem especially important when you're shopping, but becomes much more useful once you're actually using it every day.
Lower the Mattress as Your Baby Becomes More Mobile
The change from newborn to mobile baby doesn't happen overnight. You may first notice more rolling. Then your baby starts sitting independently or getting onto their hands and knees.
Those new abilities are a good reminder to check the mattress position rather than waiting until your baby is already trying to stand. The Storkcraft® Casablanca® Deluxe 5-in-1 Convertible Crib with Drawer also offers four mattress-height positions, giving parents several options as their baby grows.
You don't need to predict exactly when each milestone will happen. It's simply worth checking the crib setup whenever your baby learns to do something new.
When Should the Crib Mattress Be at Its Lowest Setting?
Once your baby begins pulling up or standing with support, the mattress should be moved to the lowest position. At that stage, a higher mattress can create a fall risk as your baby becomes able to reach and use the crib rails.
The Graco® Sasha™ 5-in-1 Convertible Crib with Drawer has four adjustable mattress-height positions, including a higher position designed for the newborn stage. That adjustability allows the sleep space to change gradually instead of making one big adjustment between the newborn and toddler stages.
The important part is staying a little ahead of new milestones rather than waiting until your baby has mastered them.
Make Mattress Height Part of Your Regular Crib Check
Parents already get used to noticing when something changes. A onesie suddenly doesn't fit. The stroller needs adjusting. A shelf that used to be out of reach isn't anymore.
Crib mattress height belongs on that same mental checklist. Whenever your baby reaches a new movement milestone, take another look at the crib. Check the mattress position, make sure everything is assembled securely, and refer back to the manufacturer's instructions if you're unsure. It's a small adjustment, but an important one.
Frequently Asked Questions
When should I first lower my baby's crib mattress?
Rather than relying on age alone, watch your baby's development. As your baby becomes more mobile, especially when sitting independently or getting onto hands and knees, it's time to review the mattress position and follow the adjustment guidance for your crib.
How many mattress height positions do Storkcraft cribs have?
It depends on the model. The Storkcraft® Santorini® Deluxe 5-in-1 Convertible Crib with Bonus Toddler Guardrail and Storkcraft® Casablanca® Deluxe 5-in-1 Convertible Crib with Drawer featured here both offer four adjustable mattress-height positions.
How many mattress height positions does the Graco® Sasha™ crib have?
The Graco® Sasha™ 5-in-1 Convertible Crib with Drawer has four adjustable mattress-height positions, including a higher option intended for the newborn stage.
When should a crib mattress be moved to the lowest setting?
By the time your baby can pull themselves up or stand with support, the mattress should be at its lowest setting. Developmental milestones are more useful than age alone when deciding when to make the adjustment.
Final Thoughts
Crib mattress height is easy to overlook at first. During the newborn stage, the higher position may simply make those frequent trips to the crib a little easier. But as your baby starts sitting, pulling up, and exploring everything within reach, the setup needs to change too.
There isn't one age that tells every parent when to lower the mattress. Your baby's movement is the better guide. Keep an eye on new milestones, follow the instructions for your specific crib, and adjust the mattress height before your baby is ready to surprise you with their next new skill.