S.H.
Just some FYI links for you on the teething subject:
http://pediatrics.about.com/od/teething/a/0107_teething.htm
http://www.thenewparentsguide.com/baby-teething.htm
http://my-teething-baby.com/teething-symptoms.php
http://www.neonsignsdepot.com/teething.html
Perhaps ask your Pediatrician. It could be anything. It could be that he is hungry and this is his "rooting" or hunger reflex. Try feeding him more, or more often, and see what happens. When they are going through growth spurts, their feeding at night may also be affected...they will sometimes wake more and need to feed. Head's up. This is normal, if it is a growth spurt.
Here are some links:
http://www.parenting.com/article/Baby/Recipes--Nutrition-...
http://www.babiesonline.com/articles/baby/growthspurts.asp
http://breastfeeding.about.com/od/breastfeedingbystage/a/...
http://www.parents.com/baby/development/physical/growing-...
http://www.parents.com/parents/childTracker/index.jsp?ord...
I would suggest reading up on growth spurts etc., there will be MANY growth spurt occasions, and growth/developmental "phases" as the baby grows. A Great book is "What to Expect the First Year" by Arlene Eisenberg. Knowing what to expect EACH month per month of age, is timeless knowledge and very helpful. All growth & developmental phases can interrupt sleep patterns in a baby and their feeding needs.
Or perhaps something is irritating his mouth?
Is he sick or anything?
It does "look" like teething symptoms...but his age is young. So best to consult your Pediatrician and ask, or to rule out anything else. If he is having a growth spurt, he just may need to feed/nurse more.
Good luck, and take care,
~Susan
www.cafepress.com/littlegoogoo