When choosing the right playpen, there are several factors to consider:

Safety: Make sure the baby playpen you choose meets safety standards and regulations. You can choose a fence that meets the safety standards set by the U.S. Consumer Product Safety Commission (CPSC) or other relevant agencies. These standards typically include requirements for fence height, gap size, stability, etc.

Materials and Quality: Choose a fence made from strong, durable materials. Common materials include wood, metal, and plastic. Make sure the fence is structurally stable and has no sharp edges or protruding parts to prevent injuries to infants and young children.

Sizing and Sizing: Choose the right fence size based on your home's needs and room layout. Measure the required fence length and height and make sure the fence will fit into the required space. Some fences have adjustable sizes that can be adjusted as needed.

Installation and Use: Choose a fence that is easy to install and use. Some fences are pressure-fitted and can be quickly installed and removed without the use of tools. Make sure the playpen has reliable locking and unlocking mechanisms to prevent misoperation by infants and young children.

Design and Function: The design of the fence should match the style and needs of the home. Some fences have a gated design, making it easier for parents to enter and exit without having to cross the fence. When choosing a fence, you can also consider additional features such as retractable, foldable, easy to clean, etc.

User reviews and recommendations: Before purchasing, read reviews and recommendations from other users to learn about the pros and cons of different brands and models of playpens. This can help make more informed choices.

The bottom line is that when choosing the right playpen, make your decision based on your own family’s specific needs and circumstances. Consider factors such as the room structure, the age and behavioral characteristics of the infant and toddler, and the family's budget to choose the most suitable playpen to ensure the safety of the infant and toddler.