It is common for babies to be hesitant about playpens initially, especially if they aren't used to independent play. Start by placing them in the playpen for very short intervals, such as 2-3 minutes at a time, and gradually increase this by a few minutes every couple of days. If the baby is distressed, consider sitting inside the playpen with them initially or staying nearby to reassure them that you are still present. Consistency is key, and with patience, your baby will likely grow more comfortable playing independently.