Notice the anchor (hope); the pomegranate in the lower right hand corner is a symbol of the resurrection and hope of eternal life. The many seeds represent the many believers who have been washed clean in the blood of the Lamb and united in one Catholic Church. The seeds from the pomegranate are also likened to Christ bursting forth from the tomb.
Grapes and baby animals all symbolize the renewal of creation through the Resurrection of Jesus.
Another early Christian tradition associates this cave with the Holy Family during their refuge from flight from Herod the Great.