Childcare Cosi DL 091915, 091915_CosiDL_ToddlerBed Owner's manual

Hello! I've reviewed the user manual for the Childcare Toddler Bed COSI-DL 091915. This manual includes instructions for assembly, operation and care. I am ready to answer your questions about setting up and using this toddler bed, including the recommended mattress size and safety precautions.
What is the recommended mattress size for the toddler bed?

What is the maximum weight the toddler bed can hold?

What should I do if I have missing parts?