What Is The Correct Height For A Crib Mattress?

Most mattress cribs come with one common feature of adjustable mattress heights. This feature enables you to be in a position to raise as well as lower you crib mattress. As a result putting your baby to bed as well getting them from bed becomes quite an easy task. As much as this feature comes with very many advantages, you have to be very careful about leaving the mattress too high as this could increase the chances of your child getting hurt. The correct height for a crib mattress entirely depends on the age and abilities of your child.


Newborns and very young babies can comfortably sleep with the mattress set at the very highest height. From birth to around five months, babies are not in a position to sit up by themselves without supporting themselves first. During this stage, it is next to impossible for your child to get themselves out of their crib. If your child is not in a position to sit up or is in this age group (0-5 months) then the highest height is okay for the crib mattress.


If your child is in a position to sit up by themselves then you may need to lower the height of your crib mattress slightly or by even as much as half depending on your crib. This stage mostly falls around 5-8 months. However, depending on your baby’s development speed, this stage can come later or even earlier. If your child can sit up, the probability of them trying to pull themselves up is quite high, especially if they are under no supervision. This is also the stage that most babies stand for the very first time. If your child can stand, then they can also try getting themselves out their crib and that is why you need to lower the height of the crib mattress.

Toddlers/older infants

If your baby can comfortably pull themselves up to a standing position then you need to lower the height of your mattress crib to the lowest height. This height will discourage your baby from attempting to get out of the crib. However, you still need to be very careful since this is still a possibility. It is, therefore, advisable to get rid of any padding or bumpers that your baby can use a stepping stone to get out of their crib.  
Check our guide for best baby mattress.

Moving on from the crib

It gets to a point where you cannot lower the height of your crib mattress anymore, this happens when your baby gets to a height of over 35 inches. At this particular point, you need to consider moving your baby from a crib to a toddler bed since you cannot lower the height of your baby’s crib mattress any lower so as to ensure your baby’s safety. When your baby is over 35 inches, the crib’s rails and your baby’s developed gross motor skills make it very easy for the baby to successfully climb out of their crib. This raises the probability of your baby injuring themselves from a fall when trying to get out of the crib. It quite risky to leave your baby unsupervised when they get to this stage. Consider changing them to a toddler bed or ensure that they are supervised at all times.

About the Author admin

Leave a Comment: