Even if your baby is not yet climbing out of the crib, it’s important to lower the mattress as soon as pulling up to a stand becomes easy. Some parents go a step further and lower crib mattresses once their babies begin sitting on their own, as standing typically occurs soon after.
Try a sleep sack. Sleep sacks provide comfort to young children, similar to swaddles. A sleep sack may restrict your child’s limbs just enough to make climbing out of the crib difficult, but your child may also find their way out of an ordinary sleep sack.
If that’s the case, it may be worth trying to put the sleep sack on backwards, to make the zipper more inaccessible. There are also many models of sleep sacks that place the zipper in harder to reach places, such as near the bottom.
Switch to a toddler bed. If your child is consistently climbing out of the crib, a toddler bed may be safer. The National Center on Early Childhood Quality Assurance recommends that child care providers have toddlers stop using cribs when they can climb out or when they are 35 inches tall.