When your baby is born, he will have “soft spots” on his head. These are actually openings in the skull where it hasn’t fully closed yet.
The first, larger one, is just above the forehead toward the top of baby’s head. The second is more toward the back of the skull.
You might even notice the spot pulsing in time with baby’s heartbeat.
These soft spots are totally normal, designed to help the skull be a bit more flexible as it’s moving through the birth canal. The tissue underneath the opening is protected by a thick membrane, but you still want to treat it with caution. No poking the soft spot, curious older brothers or sisters!
Between two and four months old, the back spot will close, but the top one won’t completely close until about 19 months old, allowing for the tremendous growth that takes place in baby’s first few years.
These spots, called the fontanels, might bulge a bit when baby cries hard or vomits, but they should pop right back into place. If they don’t or stay bulging, this is a sign for concern. If the soft spot is sunken, this is a sign of dehydration.