Indentation where flat spot was?

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Hi all - I tried doing a search but didn't really know how to word it. My son

(8 months) has been in a Boston Band for a little over 3 weeks for brachy. He's

made some improvement, going from 96% to 93% at his adjustment a week ago. I

just noticed this morning that his flat spot now feels a little more like a dent

if that makes sense. Is this normal? I figure its probably from the back of

his head growing out, but wanted to check with those of you who have been

through this. The flat spot/dent is right at the top middle back of his head

and the foam there is cut out to allow for growth. Any experience with this?

Thanks all!