All aboard the cutest layer in the drawer. This hand-knit cardigan comes in soft, subtle shades of blue with a playful choo choo train appliqued right across the chest — the kind of storybook detail that makes strangers stop to coo. A gentle yarn-button closure keeps it comfy and fuss-free over onesies and long sleeves alike.

Knit from buttery-soft acrylic, it's cozy without being bulky, so little arms still have room to reach and grab. Pair it with the matching choo choo beanie and locomotive legwarmers for the complete engineer look — an instant winner for first-birthday photos and train-obsessed toddlers everywhere.