To prepare your pet for a new baby, you can start by gradually introducing them to baby-related sounds and items, such as recordings of a baby crying or baby blankets. Additionally, maintain your pet's routine as much as possible to help them adjust to the upcoming changes. It's also essential to provide positive reinforcement and attention to your pet to reassure them during the transition period. Slowly acclimating your pet to the new baby's scent and allowing supervised interactions can also help in creating a smooth introduction.