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.
Learn some practical tips to wean your baby from breastfeeding here! Before heading out to buy formula or the first jar of baby food, stop to ask yourself what makes you want to stop breastfeeding? Do you now that the World Health Organization (WHO) recommends mothers to continue breastfeeding at least for two years?