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Its called a fontanel
Dehydration
two "spots" generally combine to make up the larger spot. they are the posterior fontanel and the anterior fontanel
Need more detail but my first instinct is to say dehydrated ! Sometimes they become sunken towards the end of the gestation period - prior to hatching.
"Fontanelle" (sometimes spelled "fontanel".) There are actually four of them, but the anterior fontanelle (directly on top) is usually the most noticeable.
Babies are born with six fontanels, or soft spots, on their skull. These fontanels allow for flexibility during birth and rapid brain growth in infancy. Over time, they gradually close as the baby's skull bones develop and fuse together.
Anterior (frontal) Fontanel Posterior (occipital) Fontanel Anterolateral (sphenoid) Fontanel Posterolateral (mastoid) Fontanel
Anterior (frontal) Fontanel Posterior (occipital) Fontanel Anterolateral (sphenoid) Fontanel Posterolateral (mastoid) Fontanel
The posterior fontanel would be in the back of the head. The coronal fontanel would be located in another part of the brain.
Fontanel means "soft spot"; fate.
The anterior fontanelle was soft at birth as this allows the baby's head to exit the birth canal safely. As the baby gets older, the fontanelle closes and hardens to a normal skull.
Fontanelle or Fontanel is the soft spot of an infant human skull between the cranial bones. The posterior fontanel closes on the first few months of life.