Okay. And all of this is your opinion. Seriously. Study after study also shows that after 12 months old, a child no longer needs the nutrition offered by formula or breast milk. At that point, it's no longer biological. It's psychological and emotional, which gets much, much more gray.
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Personally, and I said it earlier in the thread, 2 year old kids should in most cases be drinking from a cup, and eating solid foods with a fork or spoon. I wouldn't call out parents who choose to do otherwise, but certainly by 3 or 4, we're bordering on a creepy kind of codependence. I stand by that statement, personal or not. I never intended it to be taken otherwise. At 3 or 4 years old, we're no longer talking about nursing a baby.
Please do some more research. The prevailing opinion among experts on nursing is that kids should wean when THEY are ready, not when it's convenient for mom. That's why one of mine weaned at 13 months, and the other at 3.5 years. That's when they were ready. There's nothing creepy or codependent about it, and psychological needs and emotional bonding are every bit as important as nutrition. Once a child starts eating solid food, nursing generally becomes a once or twice a day event. My younger child nursed only at bedtime from around a year on. Additionally, nursing past a year old continues to confer immunity and provide protection against allergy and asthma.
Both of my sons are extremely well-adjusted, high achievers, whose behavior is considered exemplary by their teachers and other adults (though they can be a bit of a pain at home, like all kids.) Neither one is at all a mama's boy, either. You can get more information on breastfeeding at http://lllusa.org/.