Pictures of Freddie Hunt shared on his father Julian's business page, the Greens Norton Butcher, make up the £5 calendar with 100 selling out immediately.
'Fred the Farmer', as he has been nicknamed, was born under an emergency C-section in April 2019 so his parents wanted to use the calendar to thank the NHS, as well as after the coronavirus pandemic.
A customer suggested turning the photos into a calendar and 100 were printed, which sold out in two days with people ordering from as far as Devon and Scotland.
Fred's mother Tracey said: "We have been overwhelmed with the response from our family, friends and customers. We will be raising more for NHS next year."