My little guy is 9 weeks old. And after a rough start, things are getting better. However, while he's eating he likes to chew a little before he swallows. This usually happens towards the end of the feedings. It is hardly noticeable at the time, but later my nipples feel raw (like bad shoes). I try to take him off as soon as he starts gnawing. But then he starts to cry and gets hungry again shortly later. I gave him a pacifier a few times, but he does really like it and I don't want to push it. Is there another chewing toy that someone could recommend?