How to Lower Crib Mattress

As parents, nothing is more important than ensuring our children are safe and secure in their environment. One of the best ways to do this is by knowing how to lower crib mattress correctly. Doing so can help reduce the risk of suffocation or entrapment injuries, both of which are potentially deadly for infants and toddlers.

How to Lower Crib Mattress

In this post, we will provide you with simple steps on exactly how to lower a crib mattress safely and properly. We’ll also discuss some common mistakes that parents often make when adjusting the height on a crib mattress, as well as other tips for ensuring your child’s safety throughout their development. 

Step-by-Step Guidelines on How to Lower Crib Mattress

Step 1: Gather All Materials 

Before you can lower the mattress, you must have all the right tools. This includes your adjustable crib, a screwdriver (or Allen wrench), and the crib mattress itself. Make sure everything is close at hand and that you read the instructions carefully before starting.

Step 2: Identify Adjustment Screws

Many cribs have adjustable heights, but the specific location of the adjustment screws can vary by model. Generally, they will be located near the bottom of each corner post or side rail. If you’re unsure where to look for them, refer to your crib’s instructions manual.

Step 3: Loosen the Screws

Using a screwdriver or Allen wrench, loosen each of the screws until they can easily be turned by hand. Do not unscrew them all the way out, as this could weaken the frame and cause it to collapse. While loosening the screws, keep an eye on any other parts that might need loosening to adjust the mattress height.

Step 4: Lower the Mattress

Once you’ve loosened the screws, carefully lower the crib mattress until it is at a comfortable height for your baby. Make sure to adjust both corners of the mattress evenly to stay in place and not sag or become unbalanced. Keep the mattress at the lowest possible height for your child’s safety.

Step 5: Secure the Screws

Once the mattress is at the desired height, it’s important to tighten the screws again to keep the frame fully secure. Ensure you don’t over-tighten them, as this can damage both the crib and your baby.

With these simple step-by-step instructions, you’re now equipped with the knowledge of how to lower a crib mattress. By using these guidelines, you can be sure that your child is safe and secure in their sleeping environment. Good luck!

Additional Tips and Tricks for Lowering a Crib Mattress

1. Use a Crib Mattress Liner

A crib mattress liner sits between the baby and the mattress, providing an extra layer of cushioning to soften the surface area. It can also be used to help lower the height of a crib mattress and make it easier for parents to reach in and reposition their babies during sleep time.

A Crib Mattress Liner Sits Between the Baby

2. Place a Towel Underneath the Mattress

A folded towel can be used as an additional layer underneath the crib mattress, helping to lower the height and make it easier for parents to reach in. Just be sure that the material is breathable and doesn’t create a big lump when placed under the mattress.

3. Use a Crib Mattress Topper

Crib mattress toppers are an effective way to lower the height of the bed without sacrificing quality or comfort. They provide extra cushioning for the baby, making the surface area softer and easier on the parents’ backs. Additionally, crib mattress toppers can easily be taken off and washed when needed.

4. Use a Slatted Mattress Base

Replacing the standard crib mattress base with a slatted one can help lower the bed by several inches and also provide extra support for your baby’s mattress. However, ensure that the spacing between each slat is no more than 2 3/8 inches apart to meet safety standards.

By following these tips and tricks, you can easily create a safe, comfortable sleep environment for your baby that is easier for parents to access. Whether you want to lower the crib mattress or add an extra layer of cushioning, these steps will help make the process go smoothly and safely.

Standard Crib Mattress Base With a Slatted

Common Mistakes When Lowering Crib Mattress

  1. Not checking for proper support at the lowest setting. Before lowering your crib mattress, make sure that all four sides properly support it. If not, the mattress may be unstable and cause an unsafe sleeping environment for your baby.
  2. Not installing a guardrail when necessary. Once you lower your crib mattress, make sure to install a guardrail if you haven’t already. This is especially important for toddlers, as it will help prevent them from accidentally rolling out of the crib.
  3. Not securing the mattress properly when lowering. Before lowering your crib mattress, make sure to secure it properly with the provided support bars on each side or with a crib liner. Unsecured mattresses can move and cause the mattress to become unstable or even come out of the crib completely.
  4. Not using the appropriate tools for lowering your crib mattress. When lowering your crib mattress, use the tools provided with it, such as a flat-head screwdriver or an Allen wrench. Improper tools can damage the mattress and make it unsafe for your baby.

By avoiding these common mistakes, parents can ensure that their crib mattress is lowered securely and safely for their little ones. It’s important to follow manufacturer instructions carefully when lowering or adjusting your baby’s crib mattress in order to create the safest sleeping environment possible.

Safety Precaution Need to Follow for Lowering Crib Mattress

  1. Read the instruction manual. Make sure you understand all steps involved in lower the mattress. Some manufacturers have a specific way they recommend that their cribs be lowered. Follow these instructions closely.
  2. Only use the mattress support hardware that came with the crib. Do not try to use any other type of hardware, as this may put your baby at risk for injury or suffocation.
  3. Ensure that all screws and nuts are tightened securely before you lower the mattress. This will help prevent accidents from occurring if an object is accidentally dropped into the crib while you’re lowering the mattress.
  4. Lower the mattress slowly and carefully. It’s important to be cautious when lowering the mattress, as sudden movements can cause injury or suffocation if your baby is in the crib during this process.
  5. Test out the bed after you have finished lowering it. Make sure that the mattress is not too high or too low for your baby to be comfortable in. If it is uncomfortable, adjust the mattress height until your baby can sleep with ease.
Support Hardware That
Came With the Crib

It’s important to take safety precautions when lowering crib mattresses, as this process can put both you and your baby at risk of injury if done incorrectly. Follow these steps, and you should be able to lower your crib mattress without any problems.

Things You Need to Consider While Lowering Crib Mattress

1. Check the Manual

Before attempting to lower a crib mattress, check the manual with your crib for specific instructions on adjusting it. Not all cribs are designed the same way, and some may have different components that require special attention when adjusting the height.

2. Measure Twice, Cut Once

When determining where to lower your crib mattress, it is important to measure twice and only make the adjustment once. Measure the height of both the crib and mattress, then adjust accordingly. Ensure you leave enough room between the top of the mattress and the bottom of the crib so that nothing is blocking airflow or making it difficult for your child to sleep comfortably.

3. Stability is Key

Make sure the mattress is secure and stable after you adjust it. This may require tightening screws or other components of the crib frame to ensure that there is no risk of the mattress shifting or coming loose. If your crib has adjustable sides, ensure they are securely placed before moving on.

4. Pay Attention to Safety Regulations

It is important to ensure you follow safety regulations when adjusting a crib mattress. Ensure the mattress’s height is within the recommended guidelines for your child’s age and that all components of the crib frame remain secure and free from sharp or hazardous edges. Reviewing the manual and following safety regulations will help ensure a safe sleep environment for your child.

5. Don’t Leave Your Child Unattended

Finally, never leave your child unattended while adjusting or lowering a crib mattress. Ensure all components are securely placed before allowing your child back into the sleeping area.  If you are still unsure about your adjustments’ safety, consult a professional before allowing your child to sleep in it.

Allowing Child Back
Into the Sleeping Area

With these considerations in mind, you can ensure that your child’s crib mattress is adjusted safely and securely. Making the right adjustments will help ensure a comfortable sleeping environment and reduce the risk of any potential hazards.

Frequently Asked Questions

Are There Any Safety Risks Associated With Lowering a Crib Mattress? 

Generally, no. However, it is important to ensure that the mattress is properly secured to the crib frame. If it isn’t, there is a risk of the mattress coming loose and potentially causing your baby to fall out of the crib. Therefore, make sure you tighten all screws firmly after adjusting the mattress height.

Can I Lower My Infant’s Crib Mattress? 

Yes! Lowering the crib mattress is perfectly safe for your infant if properly secured to the frame. Doing so will help to ensure that your baby feels more secure and comfortable in their sleep environment. 

How Do I Lower My Baby’s Crib Mattress?

Generally, the process for lowering a baby crib mattress is fairly straightforward. First, remove any bedding from the mattress and set it aside. Next, unscrew all screws that secure the mattress to the crib frame. Once this is done, slide the mattress downwards until it reaches the desired height. Finally, securely re-tighten all screws and return the bedding to the mattress.

Securely Tighten All Screws


It’s important to create a safe sleep environment for your baby. Lowering the mattress in the crib is easy and only takes a few supplies. It starts with uninstalling the side rail and dropping it to the lowest level possible or removing it entirely. After that, it’s recommended to use rubberized padding or non-skid pads to protect your floor from any scratches from the bottom of the crib.

Finally, lower and secure the crib mattress as low as it can go so that you can ensure your baby stays safe through their development process, no matter how much it may move throughout the night.

Creating a safe sleep space for your little one requires some extra effort but will ultimately save you from any parental guilt should a worst-case scenario happen. With these tips, you can understand how to lower crib mattress, and you’re now ready to create a worry-free environment for yourself and your child!

Jennifer Branett
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