When to Lower Crib Mattress? The Details You Need to Know!

If you are like most parents and you are concerned about the safety of your baby in his crib, you have most probably purchased a height adjustable crib for him, During the first few months, it is most likely that you are using the mattress at its highest setting. But you know very well that there will come a time that you have to lower the mattress. So the question will be - when to lower crib mattress? When is the right time to make this move? Well, I have asked this question too many times before and I always get mixed answers. That’s why I have decided to do some research about it, and I will share with you some of the information I have discovered. Here they are.

When to Lower Crib Mattress

And of course, I have decided to dive straight into the topic. When you brought your baby home, it is safe that you set the mattress at its highest setting. In this way, it will be easier for you to reach your baby.

During the first few months, your baby will spend most of his time lying down, and since he is still not able to stand up, the railing does not need to be high to give him the protection he needs.

At around 3 to 5 months of his life, your baby will start to perform various developmental milestones like rolling over. He will also start moving around the baby crib soon. At this time, you may feel that the height of the railing may not be enough to protect your child so it would make sense for you to lower down the mattress to the middle setting.

Baby fall asleep

In between 6 to 9 months, your baby may already develop enough muscle strength to be able to stand on his own. At this time, he may lean on chairs and other objects to pull his weight so he can stand up. At this exact same time, he may also learn to stand up in the crib on his own. If this is the case of your child, it is about time that you lower the crib mattress to the lowest setting.

And of course, there will come a time that even the lowest setting may not be enough to provide protection for your little one. So you can expect that you may need to move him out of his crib at a certain point in time. However, the age when you should move him out may vary depending on the baby.

Other Crib Safety Tips to Keep in Mind

In addition to determining when to lower the crib mattress, there are other crib safety tips that you have to keep in mind. These are as follows:

Sleep position of your baby

Sleep position of baby

To prevent SIDS or Sudden Infant Death Syndrome, it is best that you make sure that your baby is sleeping on his back until he can learn how to roll over on his own. This developmental milestone is usually accomplished at 5 or 6 months of age.

Crib Mattress

In addition to being firm, the mattress of the crib must fit the crib snugly. As a rule of thumb, you should not be able to fit two fingers in the space between the mattress and the crib. If your crib is full size, the size of your mattress should be 51 5/8 inches long, 27 1/4 inches wide and 6 inches thick.

Crib Location

Crib location

According to AAP, your baby should sleep in your room but her own crib or bassinet until he is 6 months of age. After 6 months old, he can sleep in his nursery if he has one.

To keep baby safe, make sure to place the crib away from windows because curtains and window cords may strangulate the baby. In addition to that, the crib should also be placed far away from wall hangings or any decors that your baby can be able to grab onto. Last but not the least, you should make sure that the crib is locked in place to prevent possible accidents.


If you wish to keep your baby safe and you want the crib operation to be convenient for you, the best type of crib to buy is one with height adjustable mattress. During the first few months, the mattress should be at the highest setting but when to lower crib mattress?

You would need to lower the crib mattress to the middle setting by the time that he can sit and roll over. On the other hand, you would need to set the mattress to the lowest setting by the time that he is already able to stand on his own.

Do you have any questions? Or maybe you have a few tips to share with us? If that’s the case, please leave a comment below!

Josephine Lesley

Hi! I am Josephine G Lesley. I love children! In fact, I am an obstetric nurse and my passion is to ensure that each and every child on my watch will receive the proper care and utmost love that they deserve. I treat each child that I meet as my own and I am happy to be always surrounded with cute and loving children not just at work but also at home. I am actually a mom to a 4-year-old child and I am preparing to welcome another child soon! Because of my work and my family life, I believe that I have gained some amazing insights on child care and rearing and I want to share with you all of my knowledge through this blog. I am doing this in the hopes that I can be able to help other people in their motherhood journey! I hope you will enjoy reading my blog as I enjoyed writing it for you!

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