Read history and you will see that before formula, and especially among primitive tribes, it was not uncommon for mothers to nurse kids until they were three or four year old.
For a meat diet Neanderthal, the only supplemental food available was blood or meat juices. My father told me that when he was a child on a ranch, they would put chunks of rare cooked meat in a cloth and squeeze out the blood and juice to feed to babies (1930s).
I nursed two sons. The first for about 9 months, the second a little more than two years. About biting. The first time either one did that I yelped and jerked away. They did not do that again. My first son had two upper molars at 5 months. He was sitting in the carriage with a bag of groceries in front of him. I was chatting with a neighbor, and when I looked at him he had leaned forward and scraped a 1 inch diameter hole in a big green pepper with those two teeth. I made my own baby food based on Adelle Davis’ book “Let’s Have Healthy Children. He is now 43, in Afghanistan with Special Forces. He had one cavity a couple of years ago. My other son has also had one cavity under an impacted molar.
They did have some problem with ear infections, although not as bad as mine. I would boil water with a teaspoon of honey, add 500 mg. of Vitamin C (crushed) and a half teaspoon of powdered garlic. Put it in a baby bottle and let them suck on it during the night. It helped open their eustacian tubes and provide drainage, which helped a lot. Garlic is also a germacide.
The son I nursed for over 2 years has a far more mellow disposition. When he was about 18 months old he protested getting into pajamas with vigor. Then we would lie on the bed for nursing. He would be about a foot away and look at my bare breast and scowl at me. I would just lie quietly and after a few minutes he would inch closer. Finally he would take the breast but his body would be very stiff. Soon he would relax, and finally pat my side affectionately with one hand. He lost interest in nursing about the time we no longer had “terrible twos” struggles.