The source of this photo remains unknown, but is very probably fake. Although a woman will often see her belly bulge when a baby thrusts out a limb, the abdominal wall is too muscular and thick to allow a footprint to be seen with this clarity. The only way a fetal footprint could be seen in this way would be in the rare case of an ectopic pregnancy, which involves a fetus developing outside the uterus. This condition can be life-threatening for both mother and baby, but this photo does not appear to show an ectopic pregnancy. In addition, the footprint seems disproportionately large for a fetus.