^^^^ The guy in the pic (my younger brother) is 6ft tall, for a height reference.
My mom's mare foaled on the 4th of July. He is absolutely drop dead gorgeous, and already sold. He's a month and a half old in those pics, and he just passed the 10hh mark. Purebred Tennessee Walker. I'm working with him until he is weaned, and he has come miles from where he was at birth.
From the moment he hit the ground, he bucked, kicked, bit, struck, lunged, etc. With the help of two of my older disciplining broodmares, he stopped that in less than a week. Now, he is an angel. Other than the biting. As long has he has something in his mouth (lead rope, halter, tree branch, whatever he can grab) he is a dream to work with. Take it away, he bites at whatever he can get. He is the most friendly little thing you've ever seen, he loves people, but we can't get too close to him because of biting.
Nothing seems to work. Swatting him on the nose, tapping his side with a dressage whip when he bites, making a loud noise, etc. The thing that makes it worse is his mother is among the worst I've ever seen, and she lets him bite her and push her around. He's out with her and two other broodmares who won't take his behaviour, which has helped a lot.
Any ideas? I've already tried a lot of things, but I'm open to trying anything at this point.
For a while, I had the same problem with mine (he will be a month on Sunday the 16th). Just stay consistent and either push him away or pinch him on the nose (not hard, just enough to get his attention) when he goes to bite. It will take several days or even a couple of weeks to get him to slow down. Since I have been doing that, Rafe has stopped biting completely. He will put his muzzle on my arm or my side but has not offered to bite is several days.
Pretty much every foal I have ever encountered has been mouthy and nippy. I know my 3mo old Belgian Warmblood still is, though he's gotten a lot better. The most important thing you can do is consistely remove the offending body part from your space and make it un-fun for him to continue biting. Whenever my colt tries to nip me, I just bump in lightly on the nose and say a firm "No!" This has helped him LOTS and now he only tries to nip me when he's feeling playful or cantankerous.
First, what a gorgeous little one! Wow - he is good-looking! I had that situation with my little guy for a while too. I would like to say my training and disciplining got him out of it, but you know, I think he just eventually lost the "thrill" of it and out grew the behavior. I think, just keep doing what you are doing. Youngsters sometimes have a steep learning curve:)