1970s Kids' I’m a Little Engineer T-Shirt, Size 3-6m

Description - Adorable train engineer tee from the 70s that says "I'm a Little Engineer. It's a soft and thin single stitch tee

Details

Brand - unknown, the tag is all white

Size - I think this is approximately a baby size 3-6 month but I do not know for sure so please check all measurements to ensure fit 

Chest - 9.75" pit to pit 

Length - 12"

Condition - I don't see any holes or stains. The graphic does not look centered