Their skull is very soft for the first year so can change shape in that time. Morgan rolled around 4months & sat up around 5months. Max has just been sitting up the past month around 6months & I am starting to see his round out a little more already.
I don't think so. Most babies heads are a bit flat but once they start rolling, sitting up etc it rounds out. Morgan's head was quite flat but it changed once he got moving.