Four months old is a fun and exciting stage of a baby's development, and there are many great gift ideas that can support and encourage their growth and learning. Some popular options could include a collection of age-appropriate toys and books, a soft and cuddly stuffed animal, or a set of colorful and engaging blocks or puzzles. For the baby who loves to explore and discover, you could also consider a gift card to a favorite baby store or online retailer, a gift certificate for a baby-friendly activity or experience, or a set of fun and interactive learning toys or games. Other ideas could include a baby-themed board game or puzzle, a baby-themed coffee mug or water bottle, or a collection of baby-themed movies or TV shows. Ultimately, the best gift will depend on the recipient's interests and needs, as well as the preferences and priorities of their parents.