I am not sure what bottle jaw is so if anyone could tell me that would be awesome. I have heard people talk about it but not really say what it is. I was wondering if it may be what my 2 kids have? They are the babies out of Ruby, The black head one had a lump/abscess on his neck right under his jaw. He has had it for a few days now. It doesn't seem to bother him because he is eating and growing like crazy. Then today I noticed his brother was starting to get one too. If anyone has any idea what this may be and how to treat it I would like to know. Thanks for your help in advance.