Playpen height ranges can vary based on different standards and recommendations. The following are typical height ranges:

Standard playpen height: The height of a standard playpen usually ranges from 60 cm (approximately 2 feet) to 75 cm (approximately 2.5 feet). This height range will prevent most babies from climbing over or over the playpen.

Depending on age and stage of development: The height of the playpen can also be adjusted based on the age and stage of development of the baby. For babies who are just learning to crawl or stand, the fence should be high enough to prevent them from climbing out or onto the fence.

Adjustable Height Playpens: Some baby playpens have adjustable height features that can be adjusted according to your needs. This allows the height of the fence to be flexibly changed according to the baby's development and safety needs.

In addition to the height of the fence, other factors of the fence should be considered, such as its stability, the safety of the materials, and the size of the gaps between the fences. Proper selection and installation of a playpen, as well as ongoing supervision of your baby's activities within the playpen, are crucial to ensuring your baby's safety. It is recommended that you carefully read the manufacturer's guidelines and recommendations before purchasing a playpen to understand the appropriate playback height range for your specific baby's age and stage of development.

When considering playpen height, here are some additional details and considerations:

Age and Ability: The height of the playpen should be determined based on the age and ability of the baby. As babies grow and develop, their abilities continue to improve, including the ability to crawl, stand, and climb. The height of the fence should be high enough to prevent the baby from climbing out of or onto the fence during these stages.

Safety Standards: When purchasing a playpen, you should ensure that it meets relevant safety standards. Different regions may have different safety standards and regulations, and these standards often include requirements for fence height. Check the product's safety certification or label and make sure the fence meets local safety standards.

Gaps between fences: In addition to height, gaps between fences are also factors to consider. The gap should be small enough to prevent the baby's body or head from getting caught or stuck in the gap. Horizontal poles or vertical posts between pens should be secure and closely spaced to prevent babies from squeezing or crawling through.

Anchorage and Stability: The playpen should be able to be securely attached to the floor or wall to prevent the baby from knocking over or moving the playpen. Make sure the fence's support structure is sturdy, connections are secure, and it is installed correctly according to the manufacturer's guidelines.

Emergency Escape: The playpen should provide appropriate means of emergency escape. In an emergency, babies need to be able to safely leave the playpen. Make sure the playpen has an easy opening or removal mechanism to ensure the baby is free to leave the playpen if needed.

Supervision and Safety Awareness: Regardless of the height of the fence, babies should always be supervised to ensure their safety. Playpens should not be viewed as a complete replacement for a guardian's attention and care, but should be used as an additional safety measure.

To sum up, choosing the right playpen height is an important factor in ensuring the safety and well-being of your baby. Choose a playpen that meets the requirements based on the baby's age, ability and local safety standards, and ensure it is installed and used correctly to provide a safe space for the baby.