I think it would be really fun to add NPC babies that players can adopt, feed, care for, and raise over time. The babies could grow through all life stages naturally (baby, toddler, child, teen, etc.) and interact with age-appropriate items at each stage. For example, babies could use cribs, bottles, strollers, and baby toys, toddlers could use toddler beds, high chairs, play kitchens, and learning toys, and each stage could unlock new interactions and activities. This would make the game feel more immersive and give players a long-term family experience instead of staying in one age forever.