Hi and welcome to the forum!
Sorry to hear about your first baby. They can be difficult to keep healthy when they're that small. Hopefully your 2 new ones will stay healthy for you.

What kind of setup do you have for them? Also, if you haven't already, I highly recommend reading the different sections on basic care, nutrition, habitat and health that you can find by clicking on the "RES Basic Care" link at the top of the page.