Succulents are great indoor plants, but they do require different methods for potting than traditional plants.
Succulents are in the same category as cacti but cannot survive in the same sun exposure and high temperatures as cactus.
From looking at your pictures of your succulent babies, the two main problems you're having are caused by the same thing: your soil.
Succulents are naturally found in usually uninhabited, semi-desert areas of the world such as South America, mountainous regions, and parts of Africa. These places normally have soil that's dry and resembling sand, gravel, or loose dirt.
Potting soil could never accommodate succulents because of its compaction and lack of aeration to the roots. It also can become a breeding ground for mold and hold access moisture which can damage the plant (The yellowing of the plant shows that its soil has retained too much water and is starting to rot the roots of your plant.).
Solution:
Change your potting mix, and refrain from watering until the plant acclimates to its new growing medium.
Succulent growing mediums are sold in many gardening stores, but you can create your own by mimicking their natural environment. Succulents need soil that drains properly and that is porous for roots to breathe.
Succulent growing mixtures should be created using inorganic and organic matter. Most common mixes are composed of peat moss, some non-acidic compost, crushed stones, and perlite. Crushed stones or granite are important to create spaces in the soil for roots to breathe.
When you repot your succulents, be sure to clean the root system (removing dead roots and clumpy soil) and remove any trace of the previous soil to prevent infection of fungus, mold spores, or other problems that may have developed in your potting soil.
For more information on succulent care and to subscribe to a monthly succulent subscription with a variety of over 300 species of these beautiful plants, check out this link:
<a href="https://succulentsbox.com/?rfsn=5471513.4db77f/">Succulentbox</a>
I HOPE THIS HELPS! Please let me know when you have successfully rehabilitated your succulents.