Breeding Zebra Finches

My Zebra couple have laid 5 eggs. One is already hatched, but my female has laid 4 more new eggs, one as late as today! Is this normal and should I just leave the new baby and the new eggs alone? I am just confused about one hatched egg and yet four new white eggs. Please give me any info that might put my mind at ease or help me ensure the safety of both the parents and the eggs and hatchlings!

By Daniel T.