If you want to get a detailed looking footprint tattoo, then go to a skilled tattoo artist. Because, a tattoo artist will be able to replicate the delicate details of the baby's footprint. For this you will need to take a scanned copy and a photocopy both, of the baby's footprint. The tattoo artist will trace from the copy and then will place the traced sample on a skin patch. This will give precise guidelines for the artist to work on the skin.
Another way to get footprint tattoo designs done, is to dip the baby's foot in some colored liquid and then stamp it on the skin. But, make sure you decide the appropriate body area. For example, you can get the tattoos on ribs, stomach, back, or legs. Once you are done with this, let the stamp pattern dry a bit and wash the baby's feet clean. Then head out to the tattoo parlor. This way the artist can work on the real footprint. However, talk to a pediatrician before going with this method, as it involves dipping the baby's foot in colored liquid, and the baby's skin can be sensitive to such a liquid.
A skilled tattoo artist can script the face of the baby along with the footprint. One could choose to get the image of a dove tattooed to wish the child a peaceful life. Some get the feet encased in a heart shape border to symbolize their love for the baby. Instead of having the feet placed side-by-side, some parents get a number of footprints of their baby tattooed one after the other that looks like baby footprints trailing across their back.
For the more imaginative people, a twig with a few leaves could be included in the design just below the footprints that would look like the tip of the twig tickling the child's feet. In case one is including a name or other details, take time off to discuss the style and the font of the letters with the tattoo artist. One could also get some ideas from various websites that offer free tattoo designs.