preagainpan did your Dr look at the fontanelle at your check up? The concern with the fontanelle being too small is it close's too quickly. You don't want the anterior fontanelle to close any earlier then 12months at the earliest if not 18month as it does create pressure whilst your babies brain is big and the skull is still small. Its something that definately would need to be looked at if your Dr didn't look at it at your check up. In saying that its not something that you would need to rush of and have looked at right away. A few weeks would be fine.