If babies were born with claws like a bear, several precautions would need to be taken to ensure their safety and the safety of those around them. Here are some considerations:

1. Trimming and Safety Measures: Just like with pets, the claws would need to be regularly trimmed to prevent them from becoming excessively long and sharp. This would help minimize accidental scratching or injuries. Additionally, measures like covering the claws with soft caps or protective coverings could be explored to further reduce the risk of harm.

2. Supervision and Childproofing: Close supervision would be necessary to ensure that the babies do not inadvertently harm themselves or others. Childproofing measures, such as covering sharp corners and edges, would become even more critical to prevent accidental injuries.

3. Education and Training: As the babies grow, they would need to be taught how to handle and control their claws responsibly. Education on appropriate behavior and understanding the potential consequences of using their claws inappropriately would be crucial.

Regarding survival, having claws like a bear could potentially provide some advantages in certain situations, such as self-defense or obtaining food. However, it is important to note that human survival relies on a wide range of physical and cognitive abilities, and the presence of claws alone would not guarantee better survival.

Determining the ideal length of baby claws for human safety would require a careful balance. The claws should be long enough to serve their intended purposes but not so long that they pose a risk of accidental injury. This would likely require regular monitoring and trimming to maintain an appropriate length.