It has taken me forever to get back in here to give an update - so sorry.
So. Originally when I discovered the huge fluid-filled squishy lump that appeared out of nowhere on my baby's head (i posted about this in about feb. /march), I took her to my family doctor. He x-rayed to rule out a fracture which he said is the most common reason for such a bump to appear (fluid leaks out). When he saw that it wasn't a fracture, he was pretty unconcerned and said it would "eventually" re-absorb itself in a few months.
Even though I trust my family doctor, I ended up taking my baby to emergency a few days later because I thought the lump looked even bigger (about the size and dimension of her own little fist). I also could feel that there seemd to be a weird lumpy feeling to her skull, as though it was misshapen under the lump. The emergency doctor reiterated what my family doctor said. He looked at the x-rays and told me that everything was fine. He said that when the fluid is outside the scalp, between the scalp and the skin, they don't worry about it. He said the lumpy bumpy skull is actually the suture line between the plates of the skull and is normal even though it feels very gross and doesn't necessarily match the way the other side of the head feels in the same location.
So, still feeling as though I wanted more information about this disgusting and alarming thing on my baby's head, I went to my pediatrician. He took one look at her, smiled, and said "she got whacked in the head." I said something indignant like "what do you mean? Of course she didn't get whacked in the head!". To which he smilingly replied that yes, indeed, these bumps are caused by a whack or knock of some sort on the noggin. He said sometimes a sibling hits them when you're not looking, or they tip over, or get a bit of a bump somehow, and voila, this yucky lump is the result. It apparently happens when there's a trauma right along a skull suture line, and it doesn't have to be a big trauma, it just has to hit in the right place on the skull.
He further said that the lump can show itself even days or weeks after the bump to the head, so it's not easy to make any sort of correlation.
So that's it. None of the doctors were worried at all once they ruled out a fractured skull, and indeed, the lump began to shrink after a few weeks, and within maybe 3 months was gone altogether.
Hope this helps someone out there who has found this board because they're scared out of their wits that their precious little someone seems to have a bizarre problem. Try not to worry, and go get a fracture ruled out. If your family doctor acts confused, go to emerg and ask for a peds guy to have a look. Or just go to the pediatrician in the first place. If i'd done that, I would have saved myself weeks of panic and worry.
By the way, I had my baby at home. Her birth was totally untraumatic (well, for her... It sucked bigtime for me :lol:) and I did not have any sort of intervention. No vaccuum, no forceps, no nothing. So for parents who are reading these posts and have a baby that was born "untraumatically" but still exhibits this weird sort of lump, please know that it happened to my baby!
Take good care, try not to worry!
Kerry