Disclaimer: Not mine, merely borrowed.
It wasn't all that noticeable at first, especially with the hobbit-lads; they wore their trews short anyway. But the banging heads on lintels - that didn't used to happen at all! Now most all the lads sported goose eggs on their noggins. Some of the door frames in the older smials had even started to crack. Shoulders broader, legs longer.
What was most noticeable was the hobbit-lasses. "What is this world coming to?" their grannies wailed. Shapely ankles began peeping out from under flouncy skirts, where for ages untold it had been a well-turned-out set of toes that attracted attention.