Worn statue of a lamb on top of a grave marker. According to Stories in Stone: A Field Guide to Cemetery Symbolism and Iconography:

In funerary art, lambs usually mark the graves of children and particularly infants symbolizing innocence. The lamb is one of the most frequently used symbols of Christ in all periods of Christian art. Christ is often depicted as a shepherd but he is also referred to as the Lamb of God, as in John 1:29 – “Behold the Lamb of God which taketh away the sin of the world”.

Christian, Jewish and Muslim cultures all have their sacrificial lambs tied to vernal (springtime) rites of renewal: Jewish Passover, Christian Easter, and Muslim Ramadan.