Hi, this Euphorbia trigona seems to be growing well but the stock above where the finger is pointing in the attached photo is quite soft. It stands on its own but is bending slightly because of the softness. Is the softness normal just because the stock isn’t as thick as the older growth?
The photo submitted of your Euphorbia trigona matches the images found online without any of the diseases associated with overwatering. If plants are overwatered, cork-like patches will appear on the stems or the plants will yellow or brown. Since your plant appears dark green, enjoy the new growth.
Vigorous plant growth can require repotting. If you are interested, the following link provides a video:
https://www.thespruce.com/african-milk-tree-profile-4846360