This is described as an umbilical hernia. This is a birth defect that is usually quite minor. The lump you are noticing is likely to be a small amount of normal fat that has slipped into the location of the umbilicus (belly button).
The hernia, an opening in the muscle wall of the abdomen, is the result of an incomplete union of the two halves of the body during fetal development. If the hernia stays very small, it will need no treatment. On the other hand, if it gets bigger as the puppy grows, it may allow a loop of intestine to slip through the opening and become twisted. This would cut off the blood supply to the intestine and would require emergency surgery.
Ask your veterinarian to check the hernia at the time of each vaccination booster, about every three weeks. If the hernial opening gets big enough, the doctor will recommend that it be closed surgically. The procedure will require general anesthesia, but it is quite safe and recovery is speedy.
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