These small dimples are very common in newborn infants. It is true that this may be an indication that a baby has spins bifida but this appears to be extremely unlikely with your baby in partuicular given that he is so healthy and strong.He may have what is known as a pilonidal sinus especially if you can see hairs protruding from the dimple.
There is nothing to prevent the scan being done now just to reassure you that he does not have spina bifida.
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