He is most likely fine. Frequent stools, yellow, not too smelly, very loose are normal for the breastfed infant. This can last several months. I assume he is also wetting at least 6 times a day, tho it is hard to tell with all the poop. He is probably gaining over 8 oz a week. He may want to feed 12 or even more times a day, wanting this is not fussy, just normal. The bottom line, so to speak, is weight gain. If he is gaining well, he is great!!!!! You probably are quite tired however, don't think you can go back to full speed ahead for several weeks yet. Good luck, sounds like you and he are doing a great job.