This is pretty common. I remember my DD2 doing it at that same age, actually. I think there are a lot of possible reasons.
First of all, you'll want to ask yourself if you think baby is getting enough milk. Has baby regained birthweight? Most babies have by two weeks, and a lot have already started to gain beyond birthweight. Is baby wetting lots of diapers, and pooping several times a day? Babies this age are often fussy and cranky, so sometimes it's hard to tell if baby is fussing because of still being unsatisfied, or if it's fussiness for some other reason. Weight gain and output are the best indicators.
If baby isn't gaining-- hasn't regain birthweight by about two weeks-- then I'd suspect that for some reason baby isn't getting enough milk. You may HAVE enough, but baby isn't transferring it well. In that case, I'd be looking around locally for a good lactation consultant as soon as possible, because it's really helpful to have somebody in-person to help. Baby will need to be evaluated for a good latch and a strong enough suck. You'll want to do before-and-after weights on a good baby scale to make sure baby is getting enough milk. Baby may need some coaching and assistance to learn to transfer milk effectively.
If baby is gaining and pooping, I would be a lot less concerned. Sometimes babies pull and tug when the milk flow has slowed, because they're impatient for a faster flow. Unfortunately for us mamas, it doesn't take them long to figure out that tugging can something elicit more milk to let down. This only encourages them to do it more
. They will do this to try to increase your supply, when their need starts to get ahead of what you're making, and in a few days or a week your supply catches up again, and it all evens out. They do this a lot when they're going through a little growth spurt. The tugging can really HURT though. Switching sides as soon as the tugging starts, whether you've used that side already or not, can help. This is a supply-increasing technique called switch nursing. Another thing you can do is treat it as a poor latching habit (see below!
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Another reason for tugging might be that baby is uncomfortable and would like to burp, or needs to spit up. In that case, moving baby to an upright position and attempting to burp baby might help.
In other cases, baby is really finished getting milk, and is continuing to suckle in an attempt to soothe herself to sleep. Have you tried unlatching, and trying some other way of helping baby to fall asleep? Sometimes baby will take a little nap, and then wake up and be ready to nurse more effectively.
Finally-- it may just be that baby has just acquired a habit of latching poorly. You can deal with this by immediately unlatching baby as soon as the tugging begins. Do it gently, but say firmly, "no, not like that, sweetheart. That hurts me," or something like that. Set baby down a second, then try again to latch deeply and correctly. You may have to do this a thousand times, but eventually your persistence will pay off. Babies need to learn how to latch correctly-- a poor latch will hurt you, but will also lead to a compromised milk supply.
