Origin of thalweg. German Talweg, Thalweg : Tal, Thal, valley (from Middle High German tal, from Old High German) + Weg, way (from Middle High German wec, weg, from Old High German weg; see wegh- in Indo-European roots).
Besides as Sandra said the natural age of weaning is older than 2 and the WHO advises breastfeeding for a minimum of 2 years. It is not ridiculous that your son wants milk at 22 months. I fed my oldest child until 2.5 and am still feeding my 18 month old and plan to keep going as long as I can.
Frequent feedings also will help stimulate your milk production during the first few weeks. By 1 to 2 months of age, a breastfed baby will probably nurse 7-9 times a day. Before your milk supply is established, breastfeeding should be on demand (when your baby is hungry), which is generally every 1Â½ to 3 hours. As newborns get older, they'll nurse less often, and may develop a more reliable schedule.